Originally posted by Jonathan Mac Very nice. I'd like to pick your brains on how the 645 75mm lens performs on digital, as I don't often see results posted. I haven't bought an adapter yet. The original ones are rare and expensive but on ebay I can get a third party one for about $50, but so far haven't seen the need, but it could be useful sometimes, for 35mm film too.
So, anything about how the lens performs would be interesting - sharpness, handling etc...
I've only used it as intended and on the Q (I'm perverse like that), but at least in the center it's sharp enough for the Q, and designs like it are usually quite uniform in sharpness, so I imagine it's great on APS-C. Too much PF and a little soft at 2.8 (both probably fine on APS-C), no complaints at f/4.
As luck would have it I just posted about it
here (which I might update with more shots later, but don't count on it).
Handing is as you might expect, except the adapter design (I have a "Cirrus" chinese adapter) makes the aperture ring pretty stiff in the open direction. Sometimes you have to twist the lens (which only sort of clicks into place) to open the aperture the final half stop or so.