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I recently bought my first "real" camera, a Sony Alpha 6100 (Sony ILCE-6100). I select that both, .jpg and .arw should be stored. When I compare the .jpg and the .arw picture the geometry looks a bit different. Lines that are straight in the .jpg file look slightly curved in the .arw file. Therefore, I tried to process some of the raw images using RawTherapee 5.8 to fix this but failed.

When I click at the Transform tool and go to Lens / Geometry I tried to fix it by using the Profiled Lens Correction. By default, Automatic (Lensfun) is selected which does not really help. I tried to change it to Manually but I cannot find the Sony ILCE-6100 camera, nor the 3.5-5.6/16-50 OSS kit lens I'm using. There is also the option to import some LCP file but I could not find any and I have no idea what it is and where I can find it.

What is the best way to fix the geometry using RawTherapee?

(I hope I got the English terminology right, I'm using RawTherapee with a different language and therefore do not know how it is called exactly in English. Let me know if you have trouble following my descriptions.)

EDIT:

I realized that the problem can be fixed by using the Distortion Correction instead of the Profiled Lens Correction. However, I keep the thread open for now since somebody might be able to help me with the missing entries in the Lensfun database.

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The "Sony E 16-50mm f/3.5-5.6 OSS PZ" lens is listed in lensfun's database as supported starting with version 1.534, but it does not yet appear that there's an entry for the Alpha 6100. If you visit the web site, you can find instructions for generating images to submit for them to analyze to get new cameras and/or lenses supported. The documentation also describes how to just update the lens/camera database if you can't fully upgrade the software.

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  • Can you provide some information on where and how to download the new dB? I looked at github.com/lensfun/lensfun/blob/master/data/db/slr-sony.xml and replaced the slr-sony.xml file in my RawTherapee/5.8/share/lensfun/version_1/slr-sony.xml and RawTherapee/5.8/share/lensfun/slr-sony.xml but it did not work. It also seems like if the lens is not listed in this .xml file. – user7431005 Feb 11 at 19:21
  • @user7431005 See here. – twalberg Feb 11 at 21:40
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Unless the a6100 precooks raw files in some new way, the important corrections* should be exactly the same as for an a6000 (ILCE-6000) with the same lens attached.

Vital corrections for the SELP1650 are all about distortion: Without correction, that lens at 16mm looks like a fisheye run over by a truck, that is why you can't turn it off in camera. CA/vignetting correction should be reasonably similar between two 24MP sensors designed for DSLMs (I would be cautious about mixing vignetting corrections between NEX-7 and a6000/a6100, these sensors differ a lot in their pixel shading behaviour since the former was a design originally for a DSLR).

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