Sony E body + Mamiya 645/Phase One lens
COMPATIBLE MF MA SB
You can mount a medium format on NEX, but there are some issues with it.
Medium format systems differ in many aspects from the usual 35 mm ones. Multipliers, focal points, sensor/tape sizes are all different (actually, medium format means anything larger than 35 mm but smaller than large format, therefore "medium format" doesn't describe an exactly defined size).
Medium format lenses can be mounted on E bayonet locks The FotodioX adapter usually costs $ 50-60. You'll have to keep in mind that because the fullframe or the smaller APS-C sensors are significantly smaller than the medium format ones, therefore the center of the picture will be cropped (due to the focal length multiplier).
Kipon announced an E-mount adapter with "lens turbo" function, which has some additional lens components shrinking the medium format image to fit the fullframe sensor. A real professional solution.
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