Originally posted by derAngler
Thank you Gary.
Another question: What focal length do you get on a fullframe/crop DSLR with a Pentax 645 lens? For example I would like to use the 35mm A on both a Canon fullframe and crop camera.
I asked this question once myself, though I can't remember if it was here or on the GetDPI forum. The consensus of responses was that the focal length is what the focal length is......ie a Pentax 645 35mm lens would have the same field of view on your Canon DSLR as a Canon 35mm lens mounted on your DSLR (whether APS-C crop or full frame). I have confirmed that now with my own experience. When I mounted my Hasselblad 80mm lens on my Nikon D700, the field of view is nearly identical to that of my Nikon 85mm lens mounted on the D700. At least, that's how it appears to my eyes.
Gary