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Using Lens Profiles in Editing Software

bforbes
Posted 19/03/2020 - 11:41 Link
Does the camera used to produce a lens profile have much effect on the resulting adjustments.
For example, using ACDsee they have a profile of the Sigma DG17-35 but listed under the K-3ll.
Would the profile still apply and work correctly on a K-1/17-35 image?
JAK
Posted 22/03/2020 - 19:59 Link
Mt thought is that the profile is for the lens, not the camera, so to correct for aberrations, distortion and so on.
John K
Edited by JAK: 22/03/2020 - 19:59
barkin
Posted 22/03/2020 - 20:17 Link
JAK wrote:
Mt thought is that the profile is for the lens, not the camera, so to correct for aberrations, distortion and so on.

That's my thinking too. The lens distortion etc characteristics are what they are, whatever body the lens is attached to.
pschlute
Posted 23/03/2020 - 00:26 Link
I am not sure here. If we take the example of a aps-c specific Pentax lens that has bad vignetting on FF the FF user has two options.... to use aps-c mode in camera or to use FF mode and crop in pp.

if one were taking jpegs in-camera the Pentax built-in profiles only would be applied in aps-c mode. So any other software that used the Pentax lens correction parameters would struggle to apply them to a FF image ? How a third party profile would behave I have no idea. Would someone create a FF profile for a aps-c specific lens?

I am thinking here specifically in relation to distortion correction, but also consider vignetting correction. the format is of utmost importance here.


I really have no idea and suggest the best thing to do is perform a number of test shots and then test them in pp to find the answer.
Edited by pschlute: 23/03/2020 - 00:29
JAK
Posted 23/03/2020 - 00:39 Link
The camera doesn't have FF profiles for the APS-C DA lenses (other than the 200* and 300* (and I believe maybe one other) which are officially FF compatible. (I'm sure I read that somewhere, presumably in the K-1 manual.)
Also the profiles don't seem to be activated for raw images, just in-camera jpegs.
Third party lenses aren't supported either even when a direct equivalent lens is used, eg. the Tamron vs Pentax 18-250.
John K
pschlute
Posted 23/03/2020 - 10:24 Link
JAK wrote:
The camera doesn't have FF profiles for the APS-C DA lenses (other than the 200* and 300* (and I believe maybe one other) which are officially FF compatible. (I'm sure I read that somewhere, presumably in the K-1 manual.)
Also the profiles don't seem to be activated for raw images, just in-camera jpegs.

Yes that is in the K1 manual. The two * lenses you mention have profiles for both crop mode and FF mode.

The profiles are recorded in the raw file. Whether they are applied or not will depend on your pp software settings. In Slikypix DSPro I can choose between three settings : On/Off/Camera settings. The first two are self-explanatory. if I choose the third setting, the software will apply the corrections to the raw file if I have my K1 set to apply corrections to jpegs. Quite neat really.
bforbes
Posted 23/03/2020 - 10:38 Link
Reverse thinking Peters comments on FF and APSC lenses, I'm thinking it does make a difference. If you produce a profile for a FF lens on a APSC body that profile cannot apply to the coverage area of a full frame lens.

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JAK
Posted 23/03/2020 - 11:34 Link
The APS-C bodies will have profiles for all Pentax lenses as even FF lenses are obviously fully compatible. Does it actually matter if a FF lens in APS-C mode doesn't cover the full 135 frame? If it does matter it means the profiles aren't appropriate for the central (APS-C) portion of a photo taken in FF !
John K
Edited by JAK: 23/03/2020 - 11:45
bforbes
Posted 23/03/2020 - 11:45 Link
JAK wrote:
The APS-C bodies will have profiles for all Pentax lenses as even FF lenses are obviously fully compatible. Does it actually matter if a lens in APS-C mode doesn't cover the full 135 frame? If it does mater it means the profiles aren't appropriate for the central (APS-C) portion of a photo taken in FF !

I'm more interested in the profiles supplied with editing software than the in camera corrections. Having said that, because I shoot raw DNG, I'm assuming no profiling is applied to the DNG file
johnriley
Posted 23/03/2020 - 11:48 Link
Quote:
Having said that, because I shoot raw DNG, I'm assuming no profiling is applied to the DNG file

Increasingly, we can no longer assume that. This is particularly the case with mirrorless systems, but it's not possible to say that there are no adjustments made by the camera software to RAW capture.
Best regards, John
JAK
Posted 23/03/2020 - 11:49 Link
bforbes wrote:
I'm assuming no profiling is applied to the DNG file

That's my experience too. It might get a bit confusing if a camera profile is used then a further one applied by the processing software.
John K

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