Some of your vintage glass just got much better!
Specifically: if you are using it with a digital full frame camera and your post processing is done in Darktable, Rawtherapee (or any other software that uses the Lensfun library).
Lens artifacts like distortion and transverse chromatic aberrations (TCA) can easily be fixed in digital post processing - but, of course, only is the calibration data exists. While the Lensfun library has such data for (almost) all modern lenses, only very little is available for beautiful vintage glass. Therefore, I obtained this data for a set of 26 vintage German lenses from Carl Zeiss Jena, Meyer-Optik Görlitz, Schneider-Kreuznach, Steinheil München, and a few more. The procedure is described on my blog, together with figures of the results and instructions how to download and install the .xml file with the lens data which can be used in Darktable to apply these corrections:
https://markus-wobisch.blogspot.com/2024/11/correcting-lens-distortion-for-vintage.html
Now, my Meyer-Optik Görlitz Orestor 2.8/100mm is not only very sharp, it also got rid of its strong pincushion distortion - a huge improvement!
Lens calibration data is available for these lenses:
Carl Zeiss Jena Flektogon 20mm f/4
Carl Zeiss Jena Flektogon 35mm f/2.4
Carl Zeiss Jena Pancolar 50mm f/1.8
Carl Zeiss Jena Biotar 58mm f/2
Carl Zeiss Jena Tessar 50mm f/2.8
Carl Zeiss Jena Sonnar 135mm f/3.5
Carl Zeiss Jena Triotar 135mm f/4 (version 2)
Meyer-Optik Görlitz Orestegon 29mm f/2.8
Meyer-Optik Görlitz Lydith 30mm f/3.5
Meyer-Optik Helioplan 40mm f/4.5
Meyer-Optik Görlitz Domiplan 50mm f/2.8
Meyer-Optik Görlitz Oreston 50mm f/1.8
Meyer-Optik Görlitz Orestor 100mm f/2.8
Meyer-Optik Görlitz Orestor 135mm f/2.8
Meyer-Optik Görlitz Orestegor 200mm f/4
Pentacon 50mm f/1.8
Schneider-Kreuznach Retina-Curtagon 28mm f/4
Schneider-Kreuznach Retina-Curtagon 35mm f/2.8
Schneider-Kreuznach Curtagon 35mm f/4
Schneider-Kreuznach Retina-Tele-Arton 85mm f/4
Schneider-Kreuznach Tele-Xenar 90mm f/3.5
Schneider-Kreuznach Retina-Tele-Xenar 135mm f/4
Steinheil MĂĽnchen Auto-D-Quinaron 35mm f/2.8
Steinheil MĂĽnchen Culminar 85mm f/2.8
Steinheil MĂĽnchen Auto-D-Tele-Quinar 135mm f/2.8
Voigtländer Color-Ultron 50mm f/1.8
Beroflex 400mm f/6.3
