noise. Most CCD's have
ThermoElectric cooling (TE). The best is liquid cooling, usually
liquid nitrogen.
Jostein
:-)
- Original Message -
From: T Rittenhouse [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, January 11, 2003 2:35 AM
Subject: Re: Can digital capture do TIME exposures
On Saturday, January 11, 2003, at 09:57 AM, Jostein wrote:
...or approaching On Topic:
From A guide for the use of CCD's: #1 Where to start, found by
google at:
http://www.starchaser-obs.com/Ot_art_1.htm
Cooling is extremely important. If you use a CCD at room temperature,
thermal noise
Dan Sco
But you wouldn't have to cool your digicam to liquid nitrogen or liquid
helium extremes to see an improvement would you? Wouldn't CO2 be
sufficient for non-astrophotograpy uses?
Dan Scott (just guessing)
I think someone else posted this too, but basically we use a electronic
cooler
On 11 Jan 2003 at 13:05, Dan Scott wrote:
But you wouldn't have to cool your digicam to liquid nitrogen or liquid
helium extremes to see an improvement would you? Wouldn't CO2 be
sufficient for non-astrophotograpy uses?
Hi Dan,
Unfortunately not even tiny Peltier devices (thermo-electric
On Saturday, January 11, 2003, at 04:39 PM, Rob Studdert wrote:
What some digicam manufacturers have done is to provide a thermally
conductive
path from the image sensor to the chassis (alloy) in an effort to
reduce
thermal noise. The Olympus E series digicams are configured in this
manner.
Thanks guys
Feroze
- Original Message -
From: Jostein [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, January 11, 2003 5:57 PM
Subject: Re: Can digital capture do TIME exposures?
...or approaching On Topic:
From A guide for the use of CCD's: #1 Where to start, found
: Thursday, January 09, 2003 10:26 PM
Subject: Re: Can digital capture do TIME exposures?
On 9 Jan 2003 at 18:50, T Rittenhouse wrote:
Yep, a little liquid nitrogen will do wonders.
A lot of scientific imaging devices seem to utilize semiconductor Peltier
effect devices rather than gas cryogenics
Liquid Nitrogen Plus Photon lube(tm).
Bob
- Original Message -
From: T Rittenhouse [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, January 10, 2003 10:50 AM
Subject: Re: Can digital capture do TIME exposures?
Yep, a little liquid nitrogen will do wonders.
Ciao,
Graywolf
What is the purpose of liquid nitrogen and where is it used?
Feroze
- Original Message -
From: T Rittenhouse [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, January 10, 2003 1:50 AM
Subject: Re: Can digital capture do TIME exposures?
Yep, a little liquid nitrogen will do wonders
capture do TIME exposures?
Very fluffy ice cream? Except that Still vigorously until you can't might
happen way to fast.
At 08:05 PM 1/10/2003 +0100, you wrote:
=== At 2003-01-10, 13:28:00 Feroze wrote: ===
What is the purpose of liquid nitrogen and where is it used
Message text written by INTERNET:[EMAIL PROTECTED]
Really I meant to ask what it had to do with photography, last time i
heard
they use it to break into safes and locks, and cut warts off too
oh, all right. they refrigerate the digital sensor and the amplifiers to
lower thermal noise. works best
Subject: Re: Can digital capture do TIME exposures?
What is the purpose of liquid nitrogen and where is it used?
Feroze
- Original Message -
From: T Rittenhouse [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, January 10, 2003 1:50 AM
Subject: Re: Can digital capture do TIME
Oh, liguid helium, that's fun stuff. Hard to keep around though.
Ciao,
Graywolf
http://pages.prodigy.net/graywolfphoto
- Original Message -
From: Herb Chong [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, January 10, 2003 5:44 PM
Subject: Re: Re: Can digital capture do TIME
]
To: [EMAIL PROTECTED]
Sent: Friday, January 10, 2003 9:12 PM
Subject: Re: Re: Can digital capture do TIME exposures?
Very fluffy ice cream? Except that Still vigorously until you can't might
happen way to fast.
At 08:05 PM 1/10/2003 +0100, you wrote:
=== At 2003-01-10, 13:28:00 Feroze
Message text written by INTERNET:[EMAIL PROTECTED]
This is interesting! Since the silver halides respond to the cumulative
effect of light, it is unlikely that the digital sensor would behave in a
similar manner. I could be wrong, (and I have been before) but I believe
that the different ISO
On 9 Jan 2003 at 7:06, Herb Chong wrote:
higher ISOs are achieved mostly by increasing the analog gain of the
amplifiers. this leads to a lot of thermal noise. at least for consumer
cameras, that also means hot spots as individual pixels may go very
nonlinear. i have been thinking about
Rob Studdert wrote:
= snipped =
Also the following link is to a good utility for logging hot/dead pixels in
images generated with any digital camera, the test text logs can be filed for
later comparison in order to determine if the response of the sensor has
changed over time, see:
, 2003 2:36 AM
Subject: Can digital capture do TIME exposures?
I was wondering, do any of the
digital cameras on the market do time
exposures? i.e. if the correct exposure
is like 2 minutes at F11 ?
If they can't, it seems like there will
alway be niche for film no matter how good digital gets
Message text written by INTERNET:[EMAIL PROTECTED]
Dunno the current tech on any particular camera, but I know astro
photographers have long embraced digital. However, I think their
devices have some serious cooling systems.
-- Not that they need it much here, though... :-)
Jostein
liquid
- Original Message -
From: Herb Chong [EMAIL PROTECTED]
liquid nitrogen is normal for astro photography.
Uh... Cheers? ... :-)
There are many amateurs who use modified web-cameras on their
scopes...
Jostein
Yep, a little liquid nitrogen will do wonders.
Ciao,
Graywolf
http://pages.prodigy.net/graywolfphoto
- Original Message -
From: Jostein [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, January 09, 2003 11:40 AM
Subject: Re: Can digital capture do TIME exposures?
I think
: Thursday, January 09, 2003 11:40 AM
Subject: Re: Can digital capture do TIME exposures?
I think the ability to do long exposures depends on how much thermal
noise the chip produces, and how well it can separate noise from
signal.
Dunno the current tech on any particular camera, but I know astro
I was wondering, do any of the
digital cameras on the market do time
exposures? i.e. if the correct exposure
is like 2 minutes at F11 ?
If they can't, it seems like there will
alway be niche for film no matter how good digital gets.
JCO
J.C. O'Connell mailto:[EMAIL PROTECTED]
My Business
Message text written by INTERNET:[EMAIL PROTECTED]
I was wondering, do any of the
digital cameras on the market do time
exposures? i.e. if the correct exposure
is like 2 minutes at F11 ?
If they can't, it seems like there will
alway be niche for film no matter how good digital gets.
JCO
the
My Dimage 7 poops out at 30 seconds.
Jeff.
J. C. O'Connell wrote:
I was wondering, do any of the
digital cameras on the market do time
exposures? i.e. if the correct exposure
is like 2 minutes at F11 ?
If they can't, it seems like there will
alway be niche for film no matter how good digital
--- J. C. O'Connell [EMAIL PROTECTED] wrote:
I was wondering, do any of the
digital cameras on the market do time
exposures? i.e. if the correct exposure
is like 2 minutes at F11 ?
Enjoy:
http://www.fredmiranda.com/1Ds_review/index_longexp.html
Mark
JCO,
I believe the Nikon D100 has a Bulb setting.. therfore.. it can go for ..
well.. ever I guess
Dave
-Original Message-
From: J. C. O'Connell [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 08, 2003 8:37 PM
To: Pentax Discuss Mailing List
Subject: Can digital capture do TIME
To: Pentax Discuss Mailing List
Subject: Can digital capture do TIME exposures?
I was wondering, do any of the
digital cameras on the market do time
exposures? i.e. if the correct exposure
is like 2 minutes at F11 ?
If they can't, it seems like there will
alway be niche for film no matter how good
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