Originally posted by jatrax I assume the registration distance required to fit it in precludes making it work on DSLR mounts
That's correct - the telecompressor would interfere with the mirror in a DSLR. Another option for making a lens work "correctly" is to put a 0.66x conversion lens on the front of the lens, but that
really kills the IQ.
So far as the OP's question about having to think about what a lens is in 35mm terms, I did that for the first couple years of digital, but got over it years ago. When I adapt a Pentacon Six 80mm lens or a 6-inch Rapid Rectilinear and use it on a 35mm body, should I worry that I am not seeing a "normal" field of view? That is "correct" for those lenses on their native sensors (which I have never used). Focal length is just focal length, and 35mm is just one sensor size of many - a very popular one, but that doesn't make it "correct". Anyone who grew up using only micro 4/3 or APS-C is probably tired of being told their wide lenses should "correctly" be considered ultra-wides, their normals wide, their short teles normal, etc.