Nikon 1 body + Mamiya 645/Phase One lens
COMPATIBLE IN THEORY
We haven't found a direct adapter yet.
Medium format systems generally have much more flange focal depth than mirrorless cameras, so there are no physical barriers to install that lens on a Nikon 1 camera. However, take into consideration that you'll get a huge crop factor, because the 645 projects an even bigger picture than a fullframe, and the Nikon 1's CX sensor has a crop ratio of 2.7* compared to a full-frame rectangle.
If you're looking for such a conversion, you'll need two adapters, first you have to mount this Nikon 1 - Nikon F converter on the frame (FT1), and on that a 645 - Nikon F adapter, and voila, your lens is mounted.
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