[darktable-user] Lens Correction issues

[Dusenberg]

Hi Over last few months I've finally created a style which I can apply to all my landscape shots and which produces what I think are excellent images which usually need little or no manual attention.  A big thanks to all the developers - DT is a great piece of software. However I do have two issues with the Lens Correction module which I can't resolve and was hoping someone out there may know the answers.  I run DT 2.6.2 on a laptop with Linux Mint 19.1 Cinnamon (Ubuntu 18.4). 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? Issue 2: I have a Nikor AF-S 18-35mm f/3.5–4.5G ED lens which doesn't appear in Lensfun supported lenses list. However for TCA correction, the Nikkor AF-S 16-35mm f/4G ED entry in LC works satisfactorily. The problem is I can't find a way to get LC to use the 16-35mm lens entry instead of the as-shot lens.  Again, any ideas? Thanks ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org