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I fully agree. Slower lenses also tend to have much less longitudinal chromatic aberration than faster lenses, even when stopped down.There are more and I often find modern high resolution lenses to suffer from CA in a way making me looking for older and less "sharp" lenses.
I also have heard from someone in the past that 75 Switar and maybe even some other Switars are APO corrected. I don't do serious testing, but based on hundreds of picture I took with 26, 50, 75, I'd say they very well might be an APO. (just like Kinoptik)Well, I'll give it a try and see how it performs for me. I was mainly interested in the fast f1.1 speed, as I have the 25mm range quite well covered (esp. the Kinoptik 1.9/25mm is my favorite lens).
Btw. I read in another forum that someone called the Macro Switar 75mm "apo" corrected - I have never heard about that though. I would say quite close to from my tests.