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problem is most adapter users don't set their frame sizes so putting markings on a GG is kinda pointless.
There's really very little variation across frame sizes. Most ends up around Academy anyway and being off a bit doesn't really matter. What I really want is a director's viewfinder that can replicate the DOF characteristic of the lens. That would be sweet.
a digi SLR will give you academy frame size and most have DOF preview
Not on FD lenses they don'twhich is what I use.