rscheffler
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There are two reasons to code: 1) for correct focal length info in EXIF, if that matters to you; 2} to reduce or eliminate undesirable color shifts caused by the interaction of short exit pupil distance rangefinder lenses with the sensor.
For the second reason, sometimes the best code isn't one that matches the lens's focal length. It's a matter of doing test shots of a white wall, overcast sky, or similar, across a range of codes and evaluating the results on the computer to determine which provides the best correction.
In any case, for your lenses, I'd start with the 28 Cron v1 code for the VM28, the 35 Lux pre-ASPH for the VM35/1.4 (its design is supposedly inspired by the Lux pre-ASPH), and as you already surmised, the 50 Lux ASPH code for the TTA 50/1.4.
Of those, the 28 might be the most problematic if you're picky. Maybe try the various 28 Elmarit codes if the Cron's code doesn't look good.
One thing to keep in mind is that if you're picking codes from the camera's menu rather than physically painting them on the lens mount, any lens that has only been available since the onset of 6-bit coding is not available in the menu. The only option is to paint its code on the lens mount.
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I expect I'll still forget to change the profile when I change the lens. Like retro, if I set a manual profile, it will be all too often after I've swapped through several different lenses that I'll remember... Doh!
