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p.1 #8 · convert Sigma with canon mount to nikon mount | |
In the most basic sense, optically the 3rd party lenses are all designed to meet the longest flange distance of the current AF mounts (Nikon F at 46.5mm). The two issues that complicate things are the electronics (although I believe the Sigma lenses do some in-lens protocol and then translate to the camera system, similar to what Conurus does translating the N mount protocol to EF. The (most complicated item by far) is the control method for the aperture blades, since Canon and 4/3 requires a motor in lens for the aperture, and Nikon and Minolta/Sony use a lever, and Pentax I can't remember.
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