I had one of these 90/4 Elmars decades ago. It had terrible flare in any kind of backlight. IDK if that was because of the scratch on the front element; I blamed the satin-chrome nameplate ring... and quickly traded it in on a 1st-gen Leica 90/2 Summicron. That lens also detached from its rangefinder mount for Visoflex use. In those days I didn't shoot in LF and never thought about adapting lenses upward in format. Much later, I found out that that 90/2 (a very sharp lens) was used on some 70mm aerial cameras, so it would have covered a nominal 6x6 frame.
Back on topic, I suspect that mechanical vignetting will restrict coverage on Mr. Bedo's 135mm lens But it will be interesting to see what he finds out!
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