The continuing discussion of back focus has gotten to me. I've spent
way too much time on this shot already, however I have an excellent
example of back focus. Taken in a smoky club last night.
http://www.mindspring.com/~distilfink/PESO%20--%20backfocus.html
Equipment: Pentax *ist-Ds/smc
Did you have to use butt crack spackle on this one, or just the plug in for it.
Dave
On Fri, Apr 25, 2008 at 1:54 PM, P. J. Alling [EMAIL PROTECTED] wrote:
The continuing discussion of back focus has gotten to me. I've spent
way too much time on this shot already, however I have an excellent
butt crack spackle on this one, or just the plug in for
it.
Dave
On Fri, Apr 25, 2008 at 1:54 PM, P. J. Alling [EMAIL PROTECTED] wrote:
The continuing discussion of back focus has gotten to me. I've spent
way too much time on this shot already, however I have an excellent
example
Anthony Farr escribió:
The early Pentax DSLRs had IR cutoff filters in front of their imaging
sensors that nevertheless transmitted enough near IR light to make a useful
IR exposure with an R-72 or similar filter. Can you assert that the IR
cutoff filter over the AF sensor is more absolute in
On Feb 25, 2008, at 6:29 PM, William Robb wrote:
- Original Message -
From: Steve Desjardins
Subject: Re: K20D back focus
I've never really noticed any back/front focusing issues, but you
folks
are making me paranoid. Is there a good kind of shot for testing
this?
I'm
Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Bob Sullivan
Sent: Monday, 25 February 2008 4:21 PM
To: PDML
Subject: K20D back focus
Reading the promo literature on the K20D, I noticed a new feature.
The camera has the ability to store adjustments for backfocus
From: Bob Sullivan [EMAIL PROTECTED]
Reading the promo literature on the K20D, I noticed a new feature.
The camera has the ability to store adjustments for backfocus (or
forward) for 20 lenses.
The claim is that all the DA lenses are fine, but others may need adjusting.
Any ideas on
Anthony Farr escribió:
The difference between IR focus and visible wavelength focus is not constant
from lens to lens. Different designs of the same focal length can have
different IR focus corrections, and the correction is not necessarily
proportional when comparing lenses of different
The early Pentax DSLRs had IR cutoff filters in front of their imaging
sensors that nevertheless transmitted enough near IR light to make a useful
IR exposure with an R-72 or similar filter. Can you assert that the IR
cutoff filter over the AF sensor is more absolute in its prohibition of IR
I think it's more likely that the sensor's focus plane is more
accurate rather than tighter than that of film. The focal point is
the focal point. And since film is somewhat curved, it can never be
totally accurate.
Paul
On Feb 25, 2008, at 3:58 AM, mike wilson wrote:
From: Bob Sullivan
I'm most positive that Izumi Taniguchi who contributed allot to
explaining tips and tricks of K10D shall cover back focus adjustments
issue for K20D as soon as camera shall get on production lines.
See Digiichi website here -
http://www.digital.pentax.co.jp/en/special/digiichi/
One,
--
K100D
A better way of saying what I was trying to
From: Paul Stenquist [EMAIL PROTECTED]
Date: 2008/02/25 Mon AM 11:26:58 GMT
To: Pentax-Discuss Mail List pdml@pdml.net
Subject: Re: K20D back focus
I think it's more likely that the sensor's focus plane is more
accurate rather than
indicator or would other conditions be better?
mike wilson [EMAIL PROTECTED] 2/25/2008 3:53 PM
A better way of saying what I was trying to
From: Paul Stenquist [EMAIL PROTECTED]
Date: 2008/02/25 Mon AM 11:26:58 GMT
To: Pentax-Discuss Mail List pdml@pdml.net
Subject: Re: K20D back focus
I
- Original Message -
From: Steve Desjardins
Subject: Re: K20D back focus
I've never really noticed any back/front focusing issues, but you folks
are making me paranoid. Is there a good kind of shot for testing this?
I'm thinking of using the 50 1.4 and 135 2.8, wide open, to take
Reading the promo literature on the K20D, I noticed a new feature.
The camera has the ability to store adjustments for backfocus (or
forward) for 20 lenses.
The claim is that all the DA lenses are fine, but others may need adjusting.
Any ideas on why this might be?
Do some lenses transmit more of
- Original Message -
From: Bob Sullivan
Subject: K20D back focus
Reading the promo literature on the K20D, I noticed a new feature.
The camera has the ability to store adjustments for backfocus (or
forward) for 20 lenses.
The claim is that all the DA lenses are fine, but others
At 02:38 PM 25/02/2008, William Robb wrote:
- Original Message -
From: Bob Sullivan
Subject: K20D back focus
Reading the promo literature on the K20D, I noticed a new feature.
The camera has the ability to store adjustments for backfocus (or
forward) for 20 lenses.
The claim
- Original Message -
From: Dave Brooks [EMAIL PROTECTED]
The back focus problem a LOT of D1's suffered(as mine does) seems to be
linked to a ~slightly~ out of aligned centre sensor,acording to
Nikon.Although they have never officially admitted to this,will fix
cameras that are sent
On Dec 5, 2005, at 8:41 AM, Christian wrote:
There was a lot of whinging on Canon forums about the 20D
backfocusing When I bought mine, Tom VanVeen mentioned one of
his collegue had a problem and he asked if it was an issue on my
camera. Canon still (I believe) has not acknowledged
:[EMAIL PROTECTED]
Sendt: 5. december 2005 18:01
Til: pentax-discuss@pdml.net
Emne: Re: Back Focus
On Dec 5, 2005, at 8:41 AM, Christian wrote:
There was a lot of whinging on Canon forums about the 20D
backfocusing When I bought mine, Tom VanVeen mentioned one of
his collegue had a problem
, unleashed:
All of them seem to suffer from Back Focus.
Sorry to be a pain Jens, but the only back focus I have ever heard of in
optical hardware terms is to do with manually adjusting the rear element
(s) of a lens to achieve correct focus depending on what camera (video)
a particular lens is mounted
:10
Til: PDML
Emne: Back Focus
Date: Sun, 4 Dec 2005 23:31:00 +
From: Cotty [EMAIL PROTECTED]
To: pentax list pentax-discuss@pdml.net
Subject: Re: A better 70-200mm F. 2.8
Message-Id: [EMAIL PROTECTED]
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
On 4/12/05, Jens
: Jens Bladt [EMAIL PROTECTED]
To: pentax-discuss@pdml.net
Sent: Friday, December 02, 2005 6:19 AM
Subject: SV: Back Focus!
Thnaks, Dave.
I will pass your information on.
Regards
Jens
Jens Bladt
http://www.jensbladt.dk
-Oprindelig meddelelse-
Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED
focal lengths around
135-210mm only) on the *istD.
You (I?) see in focus objects a lot closer than the one you focused on.
Dario
- Original Message -
From: Jens Bladt [EMAIL PROTECTED]
To: pentax-discuss@pdml.net
Sent: Friday, December 02, 2005 6:19 AM
Subject: SV: Back Focus
Jens
I have never had a problem with back focus with my istD, however in low light
situations
with my D1
it does happen.
Camera tends to focus on an object further that what you really want. The
finder in the D1
is very
good, and i can usually tell if i'm off,then i just refocus.
The only
Thnaks, Dave.
I will pass your information on.
Regards
Jens
Jens Bladt
http://www.jensbladt.dk
-Oprindelig meddelelse-
Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sendt: 1. december 2005 08:57
Til: pentax-discuss@pdml.net
Emne: Re: Back Focus!
Jens
I have never had a problem
Hello list
What is back focos?
Does the camera focus closer to or further away from where it should?
Which lenses are especially prone to back focus on a *ist D?
Only analog lenses?
Please
A friend asked me. I don't know, so I ask where I expect people (you guys)
to knoe the answer :-)
Regards
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