Re: handheld long exposures

[John]

Don't get me started!

On 5/24/2017 16:26, Daniel J. Matyola wrote:

You should see what people do with my last name!

Dan Matyola

On Wed, May 24, 2017 at 4:15 PM, Paul Stenquist  wrote:


No problem. A lot of people do.

Paul via phone


On May 24, 2017, at 3:47 PM, Gonz  wrote:

Yeah, I got it wrong quite a few times.  My brain adds those extra
letters there for some odd reason.






Dan Matyola
http://www.pentaxphotogallery.com/danieljmatyola



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Re: handheld long exposures

[John]

Shouldn't that be Stenquist with only ONE 'i'? Otherwise it'd be 
"Stenqust".  8-D


On 5/24/2017 15:31, Paul Stenquist wrote:

And it’s Stenquist, no i ;-)

Paul Stenquist


On May 24, 2017, at 3:09 PM, Gonz <rgonzoma...@gmail.com> wrote:

I see!  He moved from now on.  I heard Michigan was nicer than now on anyways.


On Wed, May 24, 2017 at 1:45 PM, Ken Waller <kwal...@peoplepc.com> wrote:

I'll just say Paul from now on!



Actually he's from Michigan (;+>

Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller

- Original Message - From: "Gonz" <rgonzoma...@gmail.com>
Subject: Re: handheld long exposures




Damn... can't get it right... sorry again...   I'll just say Paul from now
on!


On Wed, May 24, 2017 at 1:35 PM, Gonz <rgonzoma...@gmail.com> wrote:


Sorry --- "Steinquist", had to check.  fail


On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:


Alright Paul, show us the steady Steinquest hand held milky way pic!
Tonight should be pretty dark, new moon is tomorrow.


On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:


Paul shouldn't have too much trouble!

Alan C

-Original Message- From: Gonz
Sent: Wednesday, May 24, 2017 4:52 PM
To: Pentax-Discuss Mail List
Subject: handheld long exposures


Anybody try this with the K-1?  Is the Pentax 5-axis image
stabilization this good?


https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/


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Re: handheld long exposures

[Paul Stenquist]

A "u" here and in Sweden, at least since the 1880s.

Paul via phone

> On May 24, 2017, at 4:43 PM, Larry Colen  wrote:
> 
> 
> 
> Paul Stenquist wrote:
>> And it’s Stenquist, no i ;-)
> 
> There is so an 'i', right after the 'u' that is probably supposed to be a 'v'.
> 
>> 
>> Paul Stenquist
> 
> -- 
> Larry Colen  l...@red4est.com (postbox on min4est) http://red4est.com/lrc
> 
> 
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Re: handheld long exposures

[Jostein]

Don't have the K-1, but give me until late August and I'll check out the 
K-3. Not dark enough at night here now.

Jostein

Den 24.05.2017 16.52, skrev Gonz:

Anybody try this with the K-1?  Is the Pentax 5-axis image
stabilization this good?

https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/




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Re: handheld long exposures

[Larry Colen]

Paul Stenquist wrote:

And it’s Stenquist, no i ;-)


There is so an 'i', right after the 'u' that is probably supposed to be 
a 'v'.




Paul Stenquist


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Re: handheld long exposures

[Gonz]

The worst that happens with my name is replacement of "z" with "s".


On Wed, May 24, 2017 at 3:26 PM, Daniel J. Matyola  wrote:
> You should see what people do with my last name!
>
> Dan Matyola
>
> On Wed, May 24, 2017 at 4:15 PM, Paul Stenquist  wrote:
>
>> No problem. A lot of people do.
>>
>> Paul via phone
>>
>> > On May 24, 2017, at 3:47 PM, Gonz  wrote:
>> >
>> > Yeah, I got it wrong quite a few times.  My brain adds those extra
>> > letters there for some odd reason.
>>
>
>
>
> Dan Matyola
> http://www.pentaxphotogallery.com/danieljmatyola
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Re: handheld long exposures

[Daniel J. Matyola]

You should see what people do with my last name!

Dan Matyola

On Wed, May 24, 2017 at 4:15 PM, Paul Stenquist  wrote:

> No problem. A lot of people do.
>
> Paul via phone
>
> > On May 24, 2017, at 3:47 PM, Gonz  wrote:
> >
> > Yeah, I got it wrong quite a few times.  My brain adds those extra
> > letters there for some odd reason.
>



Dan Matyola
http://www.pentaxphotogallery.com/danieljmatyola
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Re: handheld long exposures

[Paul Stenquist]

No problem. A lot of people do.

Paul via phone

> On May 24, 2017, at 3:47 PM, Gonz <rgonzoma...@gmail.com> wrote:
> 
> Yeah, I got it wrong quite a few times.  My brain adds those extra
> letters there for some odd reason.
> 
>> On Wed, May 24, 2017 at 2:31 PM, Paul Stenquist <pnstenqu...@comcast.net> 
>> wrote:
>> Too much light pollution in my part of Michigan to shoot the Milky Way. If I 
>> were to attempt it, I’d use the 50/1.2 and lie on the ground. I could never 
>> do it standing up. Not only would I fail to be steady, I’d probably lose my 
>> balance and topple over. And it’s Stenquist, no i ;-)
>> 
>> Paul Stenquist
>> 
>>> On May 24, 2017, at 3:09 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>> 
>>> I see!  He moved from now on.  I heard Michigan was nicer than now on 
>>> anyways.
>>> 
>>> 
>>> On Wed, May 24, 2017 at 1:45 PM, Ken Waller <kwal...@peoplepc.com> wrote:
>>>>> I'll just say Paul from now on!
>>>> 
>>>> 
>>>> Actually he's from Michigan (;+>
>>>> 
>>>> Kenneth Waller
>>>> http://www.pentaxphotogallery.com/kennethwaller
>>>> 
>>>> - Original Message - From: "Gonz" <rgonzoma...@gmail.com>
>>>> Subject: Re: handheld long exposures
>>>> 
>>>> 
>>>> 
>>>>> Damn... can't get it right... sorry again...   I'll just say Paul from now
>>>>> on!
>>>>> 
>>>>> 
>>>>>> On Wed, May 24, 2017 at 1:35 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>>>> 
>>>>>> Sorry --- "Steinquist", had to check.  fail
>>>>>> 
>>>>>> 
>>>>>>> On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>>>>> 
>>>>>>> Alright Paul, show us the steady Steinquest hand held milky way pic!
>>>>>>> Tonight should be pretty dark, new moon is tomorrow.
>>>>>>> 
>>>>>>> 
>>>>>>>> On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:
>>>>>>>> 
>>>>>>>> Paul shouldn't have too much trouble!
>>>>>>>> 
>>>>>>>> Alan C
>>>>>>>> 
>>>>>>>> -Original Message- From: Gonz
>>>>>>>> Sent: Wednesday, May 24, 2017 4:52 PM
>>>>>>>> To: Pentax-Discuss Mail List
>>>>>>>> Subject: handheld long exposures
>>>>>>>> 
>>>>>>>> 
>>>>>>>> Anybody try this with the K-1?  Is the Pentax 5-axis image
>>>>>>>> stabilization this good?
>>>>>>>> 
>>>>>>>> 
>>>>>>>> https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/
>>>>>>>> 
>>>>>>>> 
>>>>>>>> --
>>>>>>>> -- Photography takes an instant out of time, altering life by holding
>>>>>>>> it still. Dorothea Lange
>>>>>>>> 
>>>>>>>> --
>>>>>>>> PDML Pentax-Discuss Mail List
>>>>>>>> PDML@pdml.net
>>>>>>>> http://pdml.net/mailman/listinfo/pdml_pdml.net
>>>> 
>>>> 
>>>> 
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>>>> follow the directions.
>>> 
>>> 
>>> 
>>> --
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>>> it still. Dorothea Lange
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> it still. Dorothea Lange
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Re: handheld long exposures

[Gonz]

Yeah, I got it wrong quite a few times.  My brain adds those extra
letters there for some odd reason.

On Wed, May 24, 2017 at 2:31 PM, Paul Stenquist <pnstenqu...@comcast.net> wrote:
> Too much light pollution in my part of Michigan to shoot the Milky Way. If I 
> were to attempt it, I’d use the 50/1.2 and lie on the ground. I could never 
> do it standing up. Not only would I fail to be steady, I’d probably lose my 
> balance and topple over. And it’s Stenquist, no i ;-)
>
> Paul Stenquist
>
>> On May 24, 2017, at 3:09 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>
>> I see!  He moved from now on.  I heard Michigan was nicer than now on 
>> anyways.
>>
>>
>> On Wed, May 24, 2017 at 1:45 PM, Ken Waller <kwal...@peoplepc.com> wrote:
>>>> I'll just say Paul from now on!
>>>
>>>
>>> Actually he's from Michigan (;+>
>>>
>>> Kenneth Waller
>>> http://www.pentaxphotogallery.com/kennethwaller
>>>
>>> - Original Message - From: "Gonz" <rgonzoma...@gmail.com>
>>> Subject: Re: handheld long exposures
>>>
>>>
>>>
>>>> Damn... can't get it right... sorry again...   I'll just say Paul from now
>>>> on!
>>>>
>>>>
>>>> On Wed, May 24, 2017 at 1:35 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>>>
>>>>> Sorry --- "Steinquist", had to check.  fail
>>>>>
>>>>>
>>>>> On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>>>>
>>>>>> Alright Paul, show us the steady Steinquest hand held milky way pic!
>>>>>> Tonight should be pretty dark, new moon is tomorrow.
>>>>>>
>>>>>>
>>>>>> On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:
>>>>>>>
>>>>>>> Paul shouldn't have too much trouble!
>>>>>>>
>>>>>>> Alan C
>>>>>>>
>>>>>>> -Original Message- From: Gonz
>>>>>>> Sent: Wednesday, May 24, 2017 4:52 PM
>>>>>>> To: Pentax-Discuss Mail List
>>>>>>> Subject: handheld long exposures
>>>>>>>
>>>>>>>
>>>>>>> Anybody try this with the K-1?  Is the Pentax 5-axis image
>>>>>>> stabilization this good?
>>>>>>>
>>>>>>>
>>>>>>> https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> -- Photography takes an instant out of time, altering life by holding
>>>>>>> it still. Dorothea Lange
>>>>>>>
>>>>>>> --
>>>>>>> PDML Pentax-Discuss Mail List
>>>>>>> PDML@pdml.net
>>>>>>> http://pdml.net/mailman/listinfo/pdml_pdml.net
>>>
>>>
>>>
>>> --
>>> PDML Pentax-Discuss Mail List
>>> PDML@pdml.net
>>> http://pdml.net/mailman/listinfo/pdml_pdml.net
>>> to UNSUBSCRIBE from the PDML, please visit the link directly above and
>>> follow the directions.
>>
>>
>>
>> --
>> -- Photography takes an instant out of time, altering life by holding
>> it still. Dorothea Lange
>>
>> --
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Re: handheld long exposures

[Paul Stenquist]

Too much light pollution in my part of Michigan to shoot the Milky Way. If I 
were to attempt it, I’d use the 50/1.2 and lie on the ground. I could never do 
it standing up. Not only would I fail to be steady, I’d probably lose my 
balance and topple over. And it’s Stenquist, no i ;-)

Paul Stenquist

> On May 24, 2017, at 3:09 PM, Gonz <rgonzoma...@gmail.com> wrote:
> 
> I see!  He moved from now on.  I heard Michigan was nicer than now on anyways.
> 
> 
> On Wed, May 24, 2017 at 1:45 PM, Ken Waller <kwal...@peoplepc.com> wrote:
>>> I'll just say Paul from now on!
>> 
>> 
>> Actually he's from Michigan (;+>
>> 
>> Kenneth Waller
>> http://www.pentaxphotogallery.com/kennethwaller
>> 
>> - Original Message - From: "Gonz" <rgonzoma...@gmail.com>
>> Subject: Re: handheld long exposures
>> 
>> 
>> 
>>> Damn... can't get it right... sorry again...   I'll just say Paul from now
>>> on!
>>> 
>>> 
>>> On Wed, May 24, 2017 at 1:35 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>> 
>>>> Sorry --- "Steinquist", had to check.  fail
>>>> 
>>>> 
>>>> On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>>> 
>>>>> Alright Paul, show us the steady Steinquest hand held milky way pic!
>>>>> Tonight should be pretty dark, new moon is tomorrow.
>>>>> 
>>>>> 
>>>>> On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:
>>>>>> 
>>>>>> Paul shouldn't have too much trouble!
>>>>>> 
>>>>>> Alan C
>>>>>> 
>>>>>> -Original Message- From: Gonz
>>>>>> Sent: Wednesday, May 24, 2017 4:52 PM
>>>>>> To: Pentax-Discuss Mail List
>>>>>> Subject: handheld long exposures
>>>>>> 
>>>>>> 
>>>>>> Anybody try this with the K-1?  Is the Pentax 5-axis image
>>>>>> stabilization this good?
>>>>>> 
>>>>>> 
>>>>>> https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/
>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> -- Photography takes an instant out of time, altering life by holding
>>>>>> it still. Dorothea Lange
>>>>>> 
>>>>>> --
>>>>>> PDML Pentax-Discuss Mail List
>>>>>> PDML@pdml.net
>>>>>> http://pdml.net/mailman/listinfo/pdml_pdml.net
>> 
>> 
>> 
>> --
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> 
> 
> 
> -- 
> -- Photography takes an instant out of time, altering life by holding
> it still. Dorothea Lange
> 
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Re: handheld long exposures

[Gonz]

I see!  He moved from now on.  I heard Michigan was nicer than now on anyways.


On Wed, May 24, 2017 at 1:45 PM, Ken Waller <kwal...@peoplepc.com> wrote:
>> I'll just say Paul from now on!
>
>
> Actually he's from Michigan (;+>
>
> Kenneth Waller
> http://www.pentaxphotogallery.com/kennethwaller
>
> - Original Message - From: "Gonz" <rgonzoma...@gmail.com>
> Subject: Re: handheld long exposures
>
>
>
>> Damn... can't get it right... sorry again...   I'll just say Paul from now
>> on!
>>
>>
>> On Wed, May 24, 2017 at 1:35 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>
>>> Sorry --- "Steinquist", had to check.  fail
>>>
>>>
>>> On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:
>>>>
>>>> Alright Paul, show us the steady Steinquest hand held milky way pic!
>>>> Tonight should be pretty dark, new moon is tomorrow.
>>>>
>>>>
>>>> On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:
>>>>>
>>>>> Paul shouldn't have too much trouble!
>>>>>
>>>>> Alan C
>>>>>
>>>>> -Original Message- From: Gonz
>>>>> Sent: Wednesday, May 24, 2017 4:52 PM
>>>>> To: Pentax-Discuss Mail List
>>>>> Subject: handheld long exposures
>>>>>
>>>>>
>>>>> Anybody try this with the K-1?  Is the Pentax 5-axis image
>>>>> stabilization this good?
>>>>>
>>>>>
>>>>> https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/
>>>>>
>>>>>
>>>>> --
>>>>> -- Photography takes an instant out of time, altering life by holding
>>>>> it still. Dorothea Lange
>>>>>
>>>>> --
>>>>> PDML Pentax-Discuss Mail List
>>>>> PDML@pdml.net
>>>>> http://pdml.net/mailman/listinfo/pdml_pdml.net
>
>
>
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Re: handheld long exposures

[Ken Waller]

I'll just say Paul from now on!


Actually he's from Michigan (;+>

Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller

- Original Message - 
From: "Gonz" <rgonzoma...@gmail.com>

Subject: Re: handheld long exposures


Damn... can't get it right... sorry again...   I'll just say Paul from now 
on!



On Wed, May 24, 2017 at 1:35 PM, Gonz <rgonzoma...@gmail.com> wrote:

Sorry --- "Steinquist", had to check.  fail


On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:

Alright Paul, show us the steady Steinquest hand held milky way pic!
Tonight should be pretty dark, new moon is tomorrow.


On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:

Paul shouldn't have too much trouble!

Alan C

-Original Message- From: Gonz
Sent: Wednesday, May 24, 2017 4:52 PM
To: Pentax-Discuss Mail List
Subject: handheld long exposures


Anybody try this with the K-1?  Is the Pentax 5-axis image
stabilization this good?

https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/


--
-- Photography takes an instant out of time, altering life by holding
it still. Dorothea Lange

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Re: handheld long exposures

[Gonz]

Damn... can't get it right... sorry again...   I'll just say Paul from now on!


On Wed, May 24, 2017 at 1:35 PM, Gonz <rgonzoma...@gmail.com> wrote:
> Sorry --- "Steinquist", had to check.  fail
>
>
> On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:
>> Alright Paul, show us the steady Steinquest hand held milky way pic!
>> Tonight should be pretty dark, new moon is tomorrow.
>>
>>
>> On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:
>>> Paul shouldn't have too much trouble!
>>>
>>> Alan C
>>>
>>> -Original Message----- From: Gonz
>>> Sent: Wednesday, May 24, 2017 4:52 PM
>>> To: Pentax-Discuss Mail List
>>> Subject: handheld long exposures
>>>
>>>
>>> Anybody try this with the K-1?  Is the Pentax 5-axis image
>>> stabilization this good?
>>>
>>> https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/
>>>
>>>
>>> --
>>> -- Photography takes an instant out of time, altering life by holding
>>> it still. Dorothea Lange
>>>
>>> --
>>> PDML Pentax-Discuss Mail List
>>> PDML@pdml.net
>>> http://pdml.net/mailman/listinfo/pdml_pdml.net
>>> to UNSUBSCRIBE from the PDML, please visit the link directly above and
>>> follow the directions.
>>>
>>> ---
>>> This email has been checked for viruses by Avast antivirus software.
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>>>
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>>> follow the directions.
>>
>>
>>
>> --
>> -- Photography takes an instant out of time, altering life by holding
>> it still. Dorothea Lange
>
>
>
> --
> -- Photography takes an instant out of time, altering life by holding
> it still. Dorothea Lange



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Re: handheld long exposures

[Gonz]

Sorry --- "Steinquist", had to check.  fail


On Wed, May 24, 2017 at 1:34 PM, Gonz <rgonzoma...@gmail.com> wrote:
> Alright Paul, show us the steady Steinquest hand held milky way pic!
> Tonight should be pretty dark, new moon is tomorrow.
>
>
> On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:
>> Paul shouldn't have too much trouble!
>>
>> Alan C
>>
>> -Original Message- From: Gonz
>> Sent: Wednesday, May 24, 2017 4:52 PM
>> To: Pentax-Discuss Mail List
>> Subject: handheld long exposures
>>
>>
>> Anybody try this with the K-1?  Is the Pentax 5-axis image
>> stabilization this good?
>>
>> https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/
>>
>>
>> --
>> -- Photography takes an instant out of time, altering life by holding
>> it still. Dorothea Lange
>>
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>
>
> --
> -- Photography takes an instant out of time, altering life by holding
> it still. Dorothea Lange



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Re: handheld long exposures

[Gonz]

Alright Paul, show us the steady Steinquest hand held milky way pic!
Tonight should be pretty dark, new moon is tomorrow.


On Wed, May 24, 2017 at 1:07 PM, Alan C <c...@lantic.net> wrote:
> Paul shouldn't have too much trouble!
>
> Alan C
>
> -Original Message- From: Gonz
> Sent: Wednesday, May 24, 2017 4:52 PM
> To: Pentax-Discuss Mail List
> Subject: handheld long exposures
>
>
> Anybody try this with the K-1?  Is the Pentax 5-axis image
> stabilization this good?
>
> https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/
>
>
> --
> -- Photography takes an instant out of time, altering life by holding
> it still. Dorothea Lange
>
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Re: handheld long exposures

[Alan C]

Paul shouldn't have too much trouble!

Alan C

-Original Message- 
From: Gonz

Sent: Wednesday, May 24, 2017 4:52 PM
To: Pentax-Discuss Mail List
Subject: handheld long exposures

Anybody try this with the K-1?  Is the Pentax 5-axis image
stabilization this good?

https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/


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handheld long exposures

[Gonz]

Anybody try this with the K-1?  Is the Pentax 5-axis image
stabilization this good?

https://petapixel.com/2017/05/23/gorgeous-10-second-milky-way-photo-shot-hand-held/


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long exposures, some with flash

[Larry Colen]

Tonight I tried some experiments that while not an abject failure, were not 
terribly successful either.  I put my camera on a tripod and tried some long 
exposures of musicians. On a few of them I tried using my flash. I tried the 
AF50 triggered by hand, and triggered wirelessly, as well as on the camera and 
a couple with just the pop up flash.  One weird thing was that on some of the 
shots, the pop up flash seemed to have more juice than the AF 540, off the 
camera, in manual mode, at full power.

One issue is probably that at least the red channel of the stage lights was 
pretty bright so it would have taken a lot of flash to over power them.

Has anyone else tried anything along these lines?  What worked? What didn't?

Some of my more successful attempts from tonight are here:
http://www.fluidr.com/photos/ellarsee/sets/72157628602346425/

I used fluidr, because it shows the tech data.


--
Larry Colen l...@red4est.com sent from i4est





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Re: Long exposures

[Patrick Genovese]

Thank you for the info.

The noise issue makes a lot of sense but the risk to the sensor as you
say sounds like a myth.

Does the sensor heat up aprecably during an exposure? if so that may
be the root of the myth possibly with older sensors that used to heat
up more than the current crop.

Rgds

Patrick

On 10/20/06, Cory Papenfuss [EMAIL PROTECTED] wrote:
  I've heard here and there that such long exposures are not
  reccommended due to risk of damage to the sensor..  Is this true ?
  i've tried a few searches on the subject but could not find any
  conclusive information.
 
In my experience trying to do some astro-photography, a DSLR
 doesn't work very well for really long (more than a couple of minutes).
 The thermal noise of the sensor really starts becoming a problem.  I do
 know that for astro stuff, lots of short-term exposures are often stacked
 together to reduce the noise.

As far as damage to the sensor, I've heard that's mostly a myth
 and has to do with having enough light to bleach the dyes on the color
 Bayer filter on the front end.

 -Cory

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 * Electrical Engineering*
 * Virginia Polytechnic Institute and State University   *
 *


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Re: Long exposures

[Digital Image Studio]

On 20/10/06, Patrick Genovese [EMAIL PROTECTED] wrote:

 Does the sensor heat up aprecably during an exposure? if so that may
 be the root of the myth possibly with older sensors that used to heat
 up more than the current crop.

It shouldn't, a frame readout CCD sensor is essentially static during
the period of the exposure, read time is when it gets busy.

-- 
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HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
UTC(GMT)  +10 Hours
[EMAIL PROTECTED]
http://home.swiftdsl.com.au/~distudio//publications/
Pentax user since 1986, PDMLer since 1998

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Re: Long exposures

[Patrick Genovese]

Ah well one myth busted :-)

Tnx for the info

Patrick

On 10/20/06, Digital Image Studio [EMAIL PROTECTED] wrote:
 On 20/10/06, Patrick Genovese [EMAIL PROTECTED] wrote:

  Does the sensor heat up aprecably during an exposure? if so that may
  be the root of the myth possibly with older sensors that used to heat
  up more than the current crop.

 It shouldn't, a frame readout CCD sensor is essentially static during
 the period of the exposure, read time is when it gets busy.

 --
 Rob Studdert
 HURSTVILLE AUSTRALIA
 Tel +61-2-9554-4110
 UTC(GMT)  +10 Hours
 [EMAIL PROTECTED]
 http://home.swiftdsl.com.au/~distudio//publications/
 Pentax user since 1986, PDMLer since 1998

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Long exposures

[Patrick Genovese]

Hi,

Has anyone had experience with really long exposures on DSLRs ie
exposures running into several minutes maybe even hours.

I've heard here and there that such long exposures are not
reccommended due to risk of damage to the sensor..  Is this true ?
i've tried a few searches on the subject but could not find any
conclusive information.

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Patrick Genovese

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Re: Long exposures

[Ali Shah]

I have done long exposures with my E-500. I havent
tried hours but 1.5 minutes isnt too bad. 




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Re: Long exposures

[Cory Papenfuss]

 I've heard here and there that such long exposures are not
 reccommended due to risk of damage to the sensor..  Is this true ?
 i've tried a few searches on the subject but could not find any
 conclusive information.
 
In my experience trying to do some astro-photography, a DSLR 
doesn't work very well for really long (more than a couple of minutes).  
The thermal noise of the sensor really starts becoming a problem.  I do 
know that for astro stuff, lots of short-term exposures are often stacked 
together to reduce the noise.

As far as damage to the sensor, I've heard that's mostly a myth
and has to do with having enough light to bleach the dyes on the color 
Bayer filter on the front end.  

-Cory

 -- 

*
* Cory Papenfuss, Ph.D., PPSEL-IA   *
* Electrical Engineering*
* Virginia Polytechnic Institute and State University   *
*


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Re: Long exposures

[Digital Image Studio]

On 20/10/06, Patrick Genovese [EMAIL PROTECTED] wrote:
 Hi,

 Has anyone had experience with really long exposures on DSLRs ie
 exposures running into several minutes maybe even hours.

Long exposures are not advisable. Sensor noise is cumulative so
eventually every (working) pixel will saturate due to it's own self
noise.

 I've heard here and there that such long exposures are not
 reccommended due to risk of damage to the sensor..  Is this true ?
 i've tried a few searches on the subject but could not find any
 conclusive information.

Not if the integrated light value is correct for the particular exposure.

-- 
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HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
UTC(GMT)  +10 Hours
[EMAIL PROTECTED]
http://home.swiftdsl.com.au/~distudio//publications/
Pentax user since 1986, PDMLer since 1998

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Re: Long exposures on auto

[Collin Brendemuehl]

** Date: Thu, 26 Feb 2004 11:42:44 -0500 
** From: Christian [EMAIL PROTECTED] 
** 
** ...
** dusk with Velveta and had, what looked to me, like perfectly exposed
** ...
** 
** Christian 
** 


Can't call them cheesy shots 'cause Velveta ain't cheese!

Collin (curds rule) Brendemuehl

LX: Long exposures on auto

[Stephen Moore]

A question for the LXers:

What's the longest (ballpark figure) successful exposure
you've made using the LX's automatic, direct-metering mode?
Although I've grown to trust the AE mode in conventional
photo situations, around New Year's I tried out its low-
light capabilities for the first time. I was using Konica
Impresa 50 and a Vivitar Series 1 105/2.5 macro at f/8 to
shoot the Christmas tree and some of its ornaments. During
the day, with tree lights on and some daylight selectively
let in through drawn drapes, the LX was choosing exposures
on the order of 10-20 seconds and producing very good images.
After dark, however, using only the tree lights, times were
running to 4-5 minutes, sometimes more. Also tried some
whole-tree shots, using a flashlight to paint the tree and
selected ornaments. All these shots came back with a severe
case of that milky underexposed look (but, in tribute to
the Impresa 50, not at all grainy.) The light-painting shots
were better, but still spoiled by the underexposed background.
So, did I run into reciprocity failure? Is there any way to
let the LX still do its thing yet avoid the problem? Any other
LX-specific low-light tips would be much appreciated.
Thanks,
Stephen Moore

Re: Long exposures on auto

[Christian]

Before I sold my LX sigh I made several 4 or 5 minute exposures on Auto at
dusk with Velveta and had, what looked to me, like perfectly exposed slides.
I was always impressed with it's low-light performance and never experienced
reciprocity failure

Christian

- Original Message - 
From: Stephen Moore [EMAIL PROTECTED]
To: Pentax List [EMAIL PROTECTED]
Sent: Thursday, February 26, 2004 11:28 AM
Subject: LX: Long exposures on auto


 A question for the LXers:

 What's the longest (ballpark figure) successful exposure
 you've made using the LX's automatic, direct-metering mode?

 So, did I run into reciprocity failure? Is there any way to
 let the LX still do its thing yet avoid the problem? Any other
 LX-specific low-light tips would be much appreciated.

 Thanks,
 Stephen Moore

AW: Long exposures on auto

[keller.schaefer]

I have also used the LX for long time AE night shots, up to probably 4 or 5
minutes and I have also wondered whether Pentax has built in some
compensation for the reciprocity error that no doubt exists for such long
exposures.

As the Impresa is a print film and from your description of the 'milky look'
I guess that you judge camera exposure from the prints that you got - which
might not tell you the true story...

What you have to keep in mind, is that the camera exposes for an 'average
grey' exposure and for a typical night shot you do not want this, usually.
In a scene with a lot of 'black night' and some bright spots the camera
meter would probably be mistaken by the black and overexpose - to keep the
night impression you would need to correct the exposure by -1 or so.

Now with print film this becomes even worse, as the printer will
'automatically' underexpose (leave grey) the areas that you exposed to be
plain black. Correct prints from such a negative you will only get after
complaining - or if you pay for a hand print up front.

Sven


-Ursprungliche Nachricht-
Von: Stephen Moore [mailto:[EMAIL PROTECTED]
Gesendet: Donnerstag, 26. Februar 2004 17:28
An: Pentax List
Betreff: LX: Long exposures on auto


A question for the LXers:

What's the longest (ballpark figure) successful exposure
you've made using the LX's automatic, direct-metering mode?

Although I've grown to trust the AE mode in conventional
photo situations, around New Year's I tried out its low-
light capabilities for the first time. I was using Konica
Impresa 50 and a Vivitar Series 1 105/2.5 macro at f/8 to
shoot the Christmas tree and some of its ornaments. During
the day, with tree lights on and some daylight selectively
let in through drawn drapes, the LX was choosing exposures
on the order of 10-20 seconds and producing very good images.

After dark, however, using only the tree lights, times were
running to 4-5 minutes, sometimes more. Also tried some
whole-tree shots, using a flashlight to paint the tree and
selected ornaments. All these shots came back with a severe
case of that milky underexposed look (but, in tribute to
the Impresa 50, not at all grainy.) The light-painting shots
were better, but still spoiled by the underexposed background.

So, did I run into reciprocity failure? Is there any way to
let the LX still do its thing yet avoid the problem? Any other
LX-specific low-light tips would be much appreciated.

Thanks,
Stephen Moore

Re: Long exposures on auto

[Jostein]

Hi,  Stephen

The longest successful exposure I have timed with my LX is 12 minutes.

I can't comment on the film you used, but in my experience, there are big
differences between films in reciprosity properties.

I have only worked with slide films. From my experience, it kicks in at
around 1 minute exposures with Velvia, while Provia endure 4 minutes before
deviations are hard to handle. The weirdest film I have tried is the Kodak
E100VS. I find it unpredictable at exposures longer than 2 minutes. Usually,
it will give amazing blue colours, but not always. With the Provia (100F)
being as good as it is, I have never bothered to really study the Kodak.

hth,
Jostein

- Original Message - 
From: Stephen Moore [EMAIL PROTECTED]
To: Pentax List [EMAIL PROTECTED]
Sent: Thursday, February 26, 2004 5:28 PM
Subject: LX: Long exposures on auto


 A question for the LXers:

 What's the longest (ballpark figure) successful exposure
 you've made using the LX's automatic, direct-metering mode?

Re: Long exposures on auto

[William Robb]

- Original Message - 
From: Stephen Moore
Subject: LX: Long exposures on auto


 A question for the LXers:

 What's the longest (ballpark figure) successful exposure
 you've made using the LX's automatic, direct-metering mode?

The longest I have managed succesfully was around 10 minutes.
I haven't had the need to go longer than that with 35mm anyway.
The LX meter is prone to underexposure at long times and high ISO
speeds though.
I think it must be something to do with the sensitivity of the
rectifier.
Reciprocity is over rated. Set the exposure compensation to +1 stop
or so.
Some experimantation is required to pin it down perfectly, as some
films respond better than others to longish exposure times.
The nice thing is that the degree of failure is generally consistent,
so once you have a film pinned down for an expossure range, it is
repeatable.

William Robb

RE: Trick for long exposures

[Patrick White]

Ayash Kanto Mukherjee wrote:
 My procedure is like this. I make changes in the ISO setting
 of the camera
 and fool the lightmeter.
...
 Recently, Todd pointed out that some of the older bodies like K1000 or
 Canon AE1 are unable to measure the light using light meter
 for high speed
 films and low shutter speeds like 1/4 sec. If that is the
 situation, then
 the trick described above will be of no use to determine the
 duration of
 long exposures.

I've used the same procedure.  When the light meter in the K-1000 shut off
for lack of light, I punted and used spot meter mode of my PZ-1p body as a
light meter since it is more sensitive.  Without it, I would have had to
guess -- I probably would have picked the part of the scene I wanted to
meter from and then moved close enough to get a reading off only it to use
as a starting place.
One thing I learned to be careful about with my K-1000 (and maybe others
need to be as well?) is that down at the extreme end of the light meter
range, the metering gets severely non-linear.  When I'm close to that range,
I always check the reading by making a one-stop change.  If the needle
deflects more than I expect a one-stop change to do, then I can't trust
either reading.

hope that helps,
patbob ([EMAIL PROTECTED] [EMAIL PROTECTED])

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RE: Trick for long exposures

[Ayash Kanto Mukherjee]

On Tue, 29 May 2001, Patrick White wrote:
   I've used the same procedure.  When the light meter in the K-1000 shut off
 for lack of light, I punted and used spot meter mode of my PZ-1p body as a
 light meter since it is more sensitive.  Without it, I would have had to
 guess -- I probably would have picked the part of the scene I wanted to
 meter from and then moved close enough to get a reading off only it to use
 as a starting place.
   One thing I learned to be careful about with my K-1000 (and maybe others
 need to be as well?) is that down at the extreme end of the light meter
 range, the metering gets severely non-linear.  When I'm close to that range,
 I always check the reading by making a one-stop change.  If the needle
 deflects more than I expect a one-stop change to do, then I can't trust
 either reading.
 
 hope that helps,
 patbob ([EMAIL PROTECTED] [EMAIL PROTECTED])

Hi!
Many thanks for suggestion. Yes, it helped me. I didn't know that the
lightmeter of K1000 also behaves nonlinearly under certain situation.

With kind regards,
Ayash Kanto.

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Re: Trick for long exposures

[Peter Alling]

I guess you would have to go back to dead reckoning after a fashion.

First off  bw film does suffer from reciprocity failure.  According to 
Kodak tri-x requires
a 3 stop increase in exposure at an indicated exposure time of 100s and 
plus an increase
in development time.  You can find  data sheets for various emulsions in 
their respective
data guides.  At least the kodak data guides contain this information.  If 
you're using
bw film you can get acceptable exposures if you stop down the lens to 
about f8 for 35mm and
and bracket around a 1 minute exposure time. don't bother making small 
exposure
changes change by at least 2 stops and depend on the film latitude to help you
out.  Since you're using these long exposures you are probably taking 
photos of rather static
subjects so taking a series of 5 shots would be my recommendation.  True 
this doesn't exactly
give you a determination of proper exposure but you should get one or two 
negatives with an
acceptable range of contrast and detail.

At 11:59 PM 5/27/2001 +0530, Ayash Kanto wrote:

Hi all!

Recently, I started a thread on Long exposures and I got quite helpful,
creative replies from many of you. I shall like to thank once again to all
who contributed to that thread.

As a continuation of that thread, I have something new to discuss and that
is the trick for determination of long exposures.

My procedure is like this. I make changes in the ISO setting of the camera
and fool the lightmeter. Suppose, a film of 400 A.S.A. film is loaded in
the camera and the shutter dial allows a minimum shutter speed of 2
sec. If the lightmeter shows an underexposure with full aperture at 2 sec,
I change the film speed to 3200 A.S.A., an increase of 3 stops and suppose
the lightmeter shows correct exposure at 2 sec with maximum
aperture. Therefore, for 400 A.S.A. the correct exposure will be 16
sec. in principle. However, for colour films, reciprocity failure is a
significant factor to think about and therefore one should take care of
that. I don't know the situation for black and white films. Do black and
white films also suffer by reciprocity failure? If no, then f/4 at 16 sec
will give correct exposure with a 400 speed film.

Recently, Todd pointed out that some of the older bodies like K1000 or
Canon AE1 are unable to measure the light using light meter for high speed
films and low shutter speeds like 1/4 sec. If that is the situation, then
the trick described above will be of no use to determine the duration of
long exposures.

In that case, how shall I proceed to determine the duration of exposure?

Any comments, suggestions, explainations will be well appreciated.

With kind regards,
Ayash Kanto.

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http://antwrp.gsfc.nasa.gov/apod/ap010418.html

H.Sugimoto (was Re: Long exposures!)

[Fabrice Gamberini]

Ha ha ! very nice picture Rob, not very zen-like, though. It's Sydney Opera on
the right, isn't it ? 

Regarding Sugimoto's (or is it Hiroshi's ?) work, I have found a short
technical explanation in an interview about his Seascapes 
(at http://www.assemblylanguage.com/reviews/Sugimoto.html)


To get the powdery sea effect in North Atlantic Ocean - Cape Breton Island
[1996], Sugimoto hauled his American-made, wooden cabinet Durdorf and Sons
camera out to Newfoundland, mounted it on a French tripod, screwed on a Carl
Zeiss lens, loaded an 8x10 sheet of Kodak Plus-X 125 ASA film and then put a
16x neutral density filter on the unwieldy apparatus to reduce the film’s
sensitivity to well below one ASA. That's like the speed of 19th Century
film, when photography was invented, he explains. When satisfied with light
and composition, he tripped the shutter and waited *one and a half hours* for
the seascape image to burn itself onto the film.

(the picture is shown as a thumbnail on the site)

Question is: where does one find a 16x neutral grey filter ??? Do you have to
make one ?

Cheers

Fabrice


 Rob == Rob Studdert [EMAIL PROTECTED] writes:

Rob On 10 May 2001, at 17:54, Fabrice Gamberini wrote:
 I too find long exposures quite fascinating and I have discovered recently the
 work of Hiroshi Sugimoto, a Japanese photog who used to take pictures in movie
 theatres, excepted that he chose to expose the entire duration of the movie,
 which usually gives a very white rectangle, surrounded by the architectural
 details of the theatres -he likes rich ornate theaters from the 20s or 30s-.
 ( there's an interview there:
 http://www.eyestorm.com/feature/ED2n_article.asp?article_id=135)

Rob Couldn't help it, one of my theatre shots (with rich ornate harbour views :-)

Rob http://members.ozemail.com.au/~distudio/17.html

Rob Cheers,

Rob Rob Studdert
Rob HURSTVILLE AUSTRALIA
Rob Tel +61-2-9554-4110
Rob Fax +61-2-9554-9259
Rob UTC(GMT)  +10 Hours
Rob [EMAIL PROTECTED]
Rob http://www.ozemail.com.au/~distudio/publications.html



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  -- = Wavecom S.A. = -- 
Email: [EMAIL PROTECTED]

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Re: H.Sugimoto (was Re: Long exposures!)

[Aaron Reynolds]

I found a copy of his book Time Exposed with it's dust jacket torn at
a discount bookstore for $10 a number of years ago.  I opened it to a
random page, fell in love with the image (one of his movie theatre
interiors) and bought it immediately.

His photographs of wax sculptures are sort of creepy (also exposed over
a number of hours, giving them some really really strange properties),
and I must confess that I have a hard time wrapping my head around some
of his seascapes (several of them in the book are nearly a uniform grey
tone, though I don't know if that was the intention or merely poor
reproduction...I'd like to see a genuine print of one of them in person
to figure it out a bit better).

I highly recommend the book.

-Aaron


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Re: Long exposures!

[Bojidar Dimitrov]

 On 10 May 2001, at 11:13, Ayash Kanto Mukherjee wrote:
 
  My next experiment was to decrease the aperture by 5 stops, i.e., f/22 and
  therefore the exposure has to be increased by 5 stops, i.e., 64 sec. I got
  a very horrible result. It was severely underexposed. 

Decreasing the aperture and increasing the time accordingly will NORMALLY
produce a picture with the same brightness.  You have to EITHER close the
aperture OR decrease the time.

Now, why didn't this happen with your second shot?  First, the MZ-M like
99,9% of all cameras meter on automatic only up to 30 seconds, so you
didn't get your 64 seconds.  Second and more important, when a film
receives very little light, then the trick with doubling the time does not
really work.  You have to tripple or even quadrupple the time for one
f-stop difference.

Anyhow, try your shot again, with the same lighting.  Set the camera to
manual operation, and take several shots: f/5,6 and 4 seconds and f/8 and 4
seconds.  This should give you two pics with -1 and -2 stop exposure.  In
other words, 1 stop and 2 stop darker than your initial photo.

NOW; BIG WARNING.  Even if this yields correct exposure on the negatives,
the lab that makes the prints will automatically apply +1 and +2 stop
correction in order to correct your underexposed pictures.  You need to
tell them NOT to do that automatic correction.

Cheers,
Boz

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Re: Long exposures!

[PAUL STENQUIST]

When the exposure is that long, it's subject to the reciprocity failure
of the film. That could be anywhere from one to two stops, depeniding on
the emulsion. Try 128 and 256 second exposures at f22.
Paul

Ayash Kanto Mukherjee wrote:
 
 Hi!
 
 I was trying to photograph the dial of my table clock illuminated by a
 small tungsten bulb inside. I used program mode in my MZ-M and it
 suggested an aperture of f/4.5 at 2 sec with the flash recommended warning
 blinking. Well, I wanted to take the shot in complete darkness and
 therefore the use of flash never comes in picture. I took the shot and the
 result came out to be overexposed but it was more or less acceptable.
 The lens used was Pentax SMC A 35 - 80 mm f/4-5.6.
 My next experiment was to decrease the aperture by 5 stops, i.e., f/22 and
 therefore the exposure has to be increased by 5 stops, i.e., 64 sec. I got
 a very horrible result. It was severely underexposed.
 HOW THIS COULD HAPPEN? I couldn't find any explaination for it.
 Is the lightmeter working o.k.? I doubt!
 
 Any explaination/suggestion/comment is welcomed.
 
 By the way, I have both the photographs with me. So, if anybody interested
 to see the results, I can scan and send it but this kind of activity is
 dicouraged and therefore I won't do that unless and until anybody really
 interested to see.
 
 Thank you.
 
 Looking for a reply.
 
 - Ayash Kanto.
 
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Re: Long exposures!

[Ayash Kanto Mukherjee]

On Thu, 10 May 2001, Rob Studdert wrote:

 Hi,
 
 I'll have a go (I hope there aren't 100's of replies preceding mine). Firstly the 
 initial over-exposure would most probably have been due to the camera 
 metering setting the exposure to achieve an overall 18% gray. Since I 
 assume that a high proportion of the shot was dark (you didn't describe the 
 framing) 

I am sorry that I didn't describe the framing. It was the white
elliptical dial with the hour, minute, second and alarm hand. The small
bulb was located at the circumference of the ellipse to illuminate the
dial and the rest of the frame absolutely dark. I took the first shot
with all the lights of the room switched off.




 and you wished it to stay that way I would have suggested that you 
 underexpose by about two stops, this doesn't simply mean stopping down 
 the lens two stops and increasing the shutter speed, one parameter must 
 not be changed or otherwise the absolute exposure remains the same. For 
 example if the meter said 2 sec at f4.5 then you could have set the shutter 
 speed to 8 seconds or the aperture to f8 + 1/2 but not changed both.

Sorry, I could not understand '+1/2'. Do you mean half stop exposure
compensation is allowable?

 In the second case I assume that the film that you used suffered what is 
 known as reciprocity failure 

Oh! I absolutely forgot about the reciprocity failure. Though I read
it in books but it was not in my mind before/composing the shot. Thank you
very much for that.

 since the amount of light striking the film was 
 below the films low light threshold. Many films behave badly when exposed 
 to very low light most often the relationship between shutter speed and 
 aperture becomes non-linear as exposure times creep past regular exposure 
 periods ie longer than a second. Often the dye layers in the film respond 
 differently creating interesting colour shifts or casts as well.
 
 When you are working in low light situations unless you are prepared to do 
 some research to determine the response and limitations of the film that you 
 are using it is best to use faster films and wider apertures in order to keep 
 the shutter speed relatively fast ie not longer than a few seconds.

I got your point.

 I would guess that your camera and light meter are fine, be sure to 
 experiment next time and write down the settings so that you can check 
 them against what worked :-)

Surely, I should do that.

 Cheers,
 
 Rob Studdert
 HURSTVILLE AUSTRALIA

Thank you very much for your help. 

With best regards,
Ayash Kanto.

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Re: Long exposures!

[Ayash Kanto Mukherjee]

Hi Boz!

On Thu, 10 May 2001, Bojidar Dimitrov wrote:

 Decreasing the aperture and increasing the time accordingly will NORMALLY
 produce a picture with the same brightness.  You have to EITHER close the
 aperture OR decrease the time.
 
 Now, why didn't this happen with your second shot?  First, the MZ-M like
 99,9% of all cameras meter on automatic only up to 30 seconds, so you
 didn't get your 64 seconds.  

I was using bulb mode during my second shot. Therefore the meter was not
active.


 Second and more important, when a film
 receives very little light, then the trick with doubling the time does not
 really work.  You have to tripple or even quadrupple the time for one
 f-stop difference.

I didn't know this part of film story.

 Anyhow, try your shot again, with the same lighting.  Set the camera to
 manual operation, and take several shots: f/5,6 and 4 seconds and f/8 and 4
 seconds.  This should give you two pics with -1 and -2 stop exposure.  In
 other words, 1 stop and 2 stop darker than your initial photo.
 
 NOW; BIG WARNING.  Even if this yields correct exposure on the negatives,
 the lab that makes the prints will automatically apply +1 and +2 stop
 correction in order to correct your underexposed pictures.  You need to
 tell them NOT to do that automatic correction. 

 Cheers,
 Boz

Thank you very much. I will do the experiments that you have described and
as Rob has suggested to note down the the exposure values, I will do that
also so that I can compare with results of my previous experiments.

With best regards,
Ayash Kanto. 

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Re: Long exposures!

[Cy Galley]

Are you covering the eye piece? I understand that light coming thru the eye
piece on long exposures messes up the metering. My PZ-70 mentions this in
the manual AND the camera comes with a cover.  Unfortunately, you have to
remove the rubber ring about the eyepiece so I usually cover with black
tape.

Cy Galley - Bellanca Champion Club
Newsletter Editor  EAA TC
www.bellanca-championclub.com



- Original Message -
From: Ayash Kanto Mukherjee [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, May 10, 2001 12:43 AM
Subject: Long exposures!



Hi!

I was trying to photograph the dial of my table clock illuminated by a
small tungsten bulb inside. I used program mode in my MZ-M and it
suggested an aperture of f/4.5 at 2 sec with the flash recommended warning
blinking. Well, I wanted to take the shot in complete darkness and
therefore the use of flash never comes in picture. I took the shot and the
result came out to be overexposed but it was more or less acceptable.
The lens used was Pentax SMC A 35 - 80 mm f/4-5.6.
My next experiment was to decrease the aperture by 5 stops, i.e., f/22 and
therefore the exposure has to be increased by 5 stops, i.e., 64 sec. I got
a very horrible result. It was severely underexposed.
HOW THIS COULD HAPPEN? I couldn't find any explaination for it.
Is the lightmeter working o.k.? I doubt!

Any explaination/suggestion/comment is welcomed.

By the way, I have both the photographs with me. So, if anybody interested
to see the results, I can scan and send it but this kind of activity is
dicouraged and therefore I won't do that unless and until anybody really
interested to see.

Thank you.

Looking for a reply.

- Ayash Kanto.


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Re: Long exposures!

[Ayash Kanto Mukherjee]

Hi!

Aheeem! I have a question here. When I took my first shot with 2 sec
exposure, the camera recorded the track of the seconds hand. If I do a 256
sec exposure (say), shall I be able to record the circular track of the
seconds hand? If yes, it would be a spectacular photo, atleast for me.

Any comments/answer/suggestion to get the above described shot is warmly
welcomed. 

Cheers,
Ayash Kanto.

On Thu, 10 May 2001, PAUL STENQUIST wrote:

 When the exposure is that long, it's subject to the reciprocity failure
 of the film. That could be anywhere from one to two stops, depeniding on
 the emulsion. Try 128 and 256 second exposures at f22.
 Paul
 

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Re: Long exposures!

[Rob Studdert]

On 10 May 2001, at 18:38, Ayash Kanto Mukherjee wrote:

 
 Hi!
 
 Aheeem! I have a question here. When I took my first shot with 2 sec
 exposure, the camera recorded the track of the seconds hand. If I do a 256
 sec exposure (say), shall I be able to record the circular track of the
 seconds hand? If yes, it would be a spectacular photo, atleast for me.

It might just become invisible, it depends how bright the second hand is :-)

Cheers,

Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT)  +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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Re: Long exposures!

[Bill D. Casselberry]

Ayash Kanto wrote:
 
 The room was made absolutely dark, so I don't think the light meter got
 affected while taking the first shot. Rob's explaination for the
 overexposure of the first shot seems logical. And in the second shot, it
 was bulb mode exposure, so lightmeter is out of the picture.
 
Basicly, as I see your situation, the main problem you seem to
have encountered (and learned from, too ;^) is that your meter
(as all meters) offers the exposure which will yield a standard 
scene/18% grey rendition. What you have is a predominately dark 
scene - so the meter suggests excess exposure to ensure the 18%
average scene rendition. 

The comments on film repricocity are also relevant here for 
exposures longer than some particular time interval, depending
on the film. For longer exposures, it is usually better to extend
via larger aperture (up to that needed for required depth of 
field) rather than longer time, if you can.  

Knowing this tendency of meters allows the photographer to
compensate by over-riding the meter in non-average conditions.
If the scene were excessively bright (as when a light sky is a
large portion of the frame), one would use this compensation in
the opposite direction - increasing the exposure to allow the
less bright portions of the scene to get enough exposure. If your
camera (I forget what you have) has an exposure compensation dial,
this makes it a simple matter to deal with these non-average 
situations. Plus to add  minus to reduce exposure. The camera
will then adjust one or the other exposure parameter.

Bill

-
Bill D. Casselberry ; Photography on the Oregon Coast

http://www.orednet.org/~bcasselb
[EMAIL PROTECTED]
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Re: Long exposures!

[Fabrice Gamberini]

Hello Ayash,

  I don't know if the MZ-M allows multiple exposures. It probably does, in
  that case maybe you could try 60 half-second exposures... tedious, yes but
  might be worth trying. (provided you can wind and cock the shutter in less than 
half a
  second :). Or try more+shorter exposures, maybe with a 5 second interval... 

  I have seen this technique used --and have tried myself-- to photography
  crowded places and still get the impression of empty space (Railway station,
  at night,with ~20 exposures at 1/250th, all the moving people and their dog
  only appear as ghostly figures against a very solid background).

  You have to take reciprocity into account, of course.

  I too find long exposures quite fascinating and I have discovered recently
  the work of Hiroshi Sugimoto, a Japanese photog who used to take pictures in
  movie theatres, excepted that he chose to expose the entire duration of the
  movie, which usually gives a very white rectangle, surrounded by the
  architectural details of the theatres -he likes rich ornate theaters from
  the 20s or 30s-.
( there's an interview there:
  http://www.eyestorm.com/feature/ED2n_article.asp?article_id=135)
  
  I don't know what kind of film he uses, though.

  cheers,

Fabrice 

 Ayash == Ayash Kanto Mukherjee [EMAIL PROTECTED] writes:

Ayash On Thu, 10 May 2001, Rob Studdert wrote:

 On 10 May 2001, at 18:38, Ayash Kanto Mukherjee wrote:
 
  
  Hi!
  
  Aheeem! I have a question here. When I took my first shot with 2 sec
  exposure, the camera recorded the track of the seconds hand. If I do a 256
  sec exposure (say), shall I be able to record the circular track of the
  seconds hand? If yes, it would be a spectacular photo, atleast for me.
 
 It might just become invisible, it depends how bright the second hand is :-)
 
 Cheers,
 

Ayash Hi Rob!

Ayash I think the only method left is to do the experiment and see what happens
Ayash and that I am going to do this night.


 Rob Studdert
 HURSTVILLE AUSTRALIA

Ayash Cheers
Ayash Ayash Kanto

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-- 
Fabrice Gambérini
  -- = Wavecom S.A. = -- 
Email: [EMAIL PROTECTED]

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Re: Long exposures!

[Rob Studdert]

On 10 May 2001, at 17:54, Fabrice Gamberini wrote:

   I too find long exposures quite fascinating and I have discovered recently the
   work of Hiroshi Sugimoto, a Japanese photog who used to take pictures in movie
   theatres, excepted that he chose to expose the entire duration of the movie,
   which usually gives a very white rectangle, surrounded by the architectural
   details of the theatres -he likes rich ornate theaters from the 20s or 30s-.
 ( there's an interview there:
   http://www.eyestorm.com/feature/ED2n_article.asp?article_id=135)

Couldn't help it, one of my theatre shots (with rich ornate harbour views :-)

http://members.ozemail.com.au/~distudio/17.html

Cheers,

Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT)  +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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Re: Long exposures!

[Ayash Kanto Mukherjee]

On Thu, 10 May 2001, Bill D. Casselberry wrote:

  
   Basicly, as I see your situation, the main problem you seem to
   have encountered (and learned from, too ;^) is that your meter
   (as all meters) offers the exposure which will yield a standard 
   scene/18% grey rendition. What you have is a predominately dark 
   scene - so the meter suggests excess exposure to ensure the 18%
   average scene rendition. 
 
   The comments on film repricocity are also relevant here for 
   exposures longer than some particular time interval, depending
   on the film. For longer exposures, it is usually better to extend
   via larger aperture (up to that needed for required depth of 
   field) rather than longer time, if you can.  
 
   Knowing this tendency of meters allows the photographer to
   compensate by over-riding the meter in non-average conditions.
   If the scene were excessively bright (as when a light sky is a
   large portion of the frame), one would use this compensation in
   the opposite direction - increasing the exposure to allow the
   less bright portions of the scene to get enough exposure. If your
   camera (I forget what you have) has an exposure compensation dial,

My camera is MZ-M and it has an exposure compenstion dial.
Earlier, when I was quite new to photography, I was unaware of special
trick (the one that you have suggested above) to do metering of
non-average situations. As a result, either my
main subject showed an underexposure or overexposure. Now, I am getting
some acceptable results but I am not much happy with it. I feel that the
use of neutral density graduated filter would have done better for
non-average situations.

   this makes it a simple matter to deal with these non-average 
   situations. Plus to add  minus to reduce exposure. The camera
   will then adjust one or the other exposure parameter.
 
   Bill
 
 -
 Bill D. Casselberry ; Photography on the Oregon Coast
 
 http://www.orednet.org/~bcasselb
 [EMAIL PROTECTED]
 -

Thank you very much for your explaination and suggestion. 

With best regards,
Ayash Kanto.

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Re: Long exposures!

[Ayash Kanto Mukherjee]

Hello Fabrice!

Now there is a big problem. MZ-M does not allows multiple exposure but the
kind of experiment you have suggested can be done with bulb mode. The
extra labour that I have to do is cover the lens occasionally with a black
cloth. I can not use the lens cap because it disturbs the position of the
camera.

Anyway, many thanks for such a creative suggestion. It could be worth
trying out.

Cheers,
Ayash Kanto.


On 10 May 2001, Fabrice Gamberini wrote:

 Hello Ayash,
 
   I don't know if the MZ-M allows multiple exposures. It probably does, in
   that case maybe you could try 60 half-second exposures... tedious, yes but
   might be worth trying. (provided you can wind and cock the shutter in 
less than half a
   second :). Or try more+shorter exposures, maybe with a 5 second interval... 
 
   I have seen this technique used --and have tried myself-- to photography
   crowded places and still get the impression of empty space (Railway station,
   at night,with ~20 exposures at 1/250th, all the moving people and their dog
   only appear as ghostly figures against a very solid background).
 
   You have to take reciprocity into account, of course.
 
   I too find long exposures quite fascinating and I have discovered recently
   the work of Hiroshi Sugimoto, a Japanese photog who used to take pictures in
   movie theatres, excepted that he chose to expose the entire duration of the
   movie, which usually gives a very white rectangle, surrounded by the
   architectural details of the theatres -he likes rich ornate theaters from
   the 20s or 30s-.
 ( there's an interview there:
   http://www.eyestorm.com/feature/ED2n_article.asp?article_id=135)
   
   I don't know what kind of film he uses, though.
 
   cheers,
 
 Fabrice 
 
  Ayash == Ayash Kanto Mukherjee [EMAIL PROTECTED] writes:
 
 Ayash On Thu, 10 May 2001, Rob Studdert wrote:
 
  On 10 May 2001, at 18:38, Ayash Kanto Mukherjee wrote:
  
   
   Hi!
   
   Aheeem! I have a question here. When I took my first shot with 2 sec
   exposure, the camera recorded the track of the seconds hand. If I do a 256
   sec exposure (say), shall I be able to record the circular track of the
   seconds hand? If yes, it would be a spectacular photo, atleast for me.
  
  It might just become invisible, it depends how bright the second hand is :-)
  
  Cheers,
  
 
 Ayash Hi Rob!
 
 Ayash I think the only method left is to do the experiment and see what happens
 Ayash and that I am going to do this night.
 
 
  Rob Studdert
  HURSTVILLE AUSTRALIA
 
 Ayash Cheers
 Ayash Ayash Kanto
 
 Ayash -
 Ayash This message is from the Pentax-Discuss Mail List.  To unsubscribe,
 Ayash go to http://www.pdml.net and follow the directions. Don't forget to
 Ayash visit the Pentax Users' Gallery at http://pug.komkon.org .
 
 
 
 

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