Quote Originally Posted by Greg View Post
OK... so how much does the seeming ever present to some degree Schneideritis to (older?) Schneider lenses effect their performance? Rodenstockitis, Zeissitis, and Nikkoritis seem to never be mentioned.

I've used (and still use) several vintage lenses with plenty of xxxxitis, subjectively without effecting the images they throw. Most of my exposures made a f/45 and f/64.... is the effect of Schneideritis less felt at these small apertures?
The black paint inside the lens is intended to reduce stray light in some conditions. If white paint was used instead black you would notice an increase of stray light (non image forming light). At the end the dots from schneideritis have an small total surface, so no increase in stray light can be noticed. If a large share of the inner surface was peeled off, sun was not in the framming but still bathing the glass, and no lens hood was used... then some increase of stray light would be noticed.