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What I've done is attach my new Mamiya's 90mm f/3.8 lens to my 12 megapixel micro-four-thirds camera. What I've found is a great surprise and here's why:
This is a 100% crop from the MFT sensor (18mm across), at 12mp. While it's rather blurry here, the result is impressive when you consider the size of the film, and that this is completely wide open.
6x7 is 67mm across, MFT is 18mm across.
67 / 18 = 3.72
12mp x 3.72 = 44.64
Assuming that the film would be able to keep up with the detail coming from this lens, I can expect this result at 100% of a 44.64 megapixel scan of an image taken with this lens wide open.
This is a very good result from a camera built in 1970. That I can see specks of dust is very promising at this magnification, especially if the 90mm is NOT one of the original Mamiya lenses regarded as being very sharp.
