Hi Frieder,
copied this from a google search
he lens correction profiles (distortion and vignetting) are embedded in the
Nikon NEF metadata. They're not actually applied to the image but instead used
by raw processors such as ACR/LR, which apply the correction profile to the
image when you import the raw.
Dr Terry Pinfold
Cytometry & Histology Lab Manager
University of Tasmania
17 Liverpool St, Hobart, 7000
Ph 6226 4846 or 0408 699053
________________________________
From: frieder <f...@gmx.net>
Sent: Tuesday, 17 December 2019 1:04 AM
To: Dusenberg <dusenb...@gmx.co.uk>; darktable-user@lists.darktable.org
<darktable-user@lists.darktable.org>
Subject: Re: [darktable-user] Lens Correction issues
Am Donnerstag, den 05.12.2019, 09:08 +0000 schrieb Dusenberg:
> Hi
>
>
>
> Issue 1:
> My Nikon D810 automatically applies lens distortion correction so the
> raw files are already corrected for the lens in use. I have Nikon
> AF-S lenses so this works consistently and accurately. However the
> camera does not correct for TCA. For example, my 24-70 lens
> generally needs a red correction of 1.00020-1.00040 while my 70-200
> needs 1.00010-1.00030. I have to do this manually for every shot
> which is a pain and 'something else to do'. What I want is for DT to
> apply Lens Correction as part of my style so that lens and shot data
> of the current image is used but then only the TCA correction is
> applied with a preset value of say red:1.00030 for the 24-70 lens. I
> can then amend this if necessary during my normal workflow review of
> each image. I have tried and failed to do this. The problem I find
> is that if I open LC in Darkroom, set it to TCA Only enter a
> correction and save as a preset, when I use that preset whether alone
> or as part of a style, LC no longer looks up the lens and shot data
> for the current image, but applies all the settings present during
> the creation of the preset - which means the wrong lens, f/stop,
> distance. I may be missing something obvious but I've no idea what it
> is. Does anyone know how to do what I need?
>
When creating a new preset, it is possible to define to use it
automatically in some specific cases. Therefore one of the Options
in the naming-dialoque must be activated.
Activating one of the ceckboxes opens more Input fields whicht allows
to define this style automatically used for a specific lens.
I made a screeshot of the dialoque, albeit it is in german, I hope it
helps finding this hidden options.
regards,
F.
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