If the difference is low, other factors such as the diameter of the fastening flanges of the two systems also play a role. Objective adapter are generally easier to manufacture if the camera housing has a lens connection with a large diameter. This is one of the reasons why FotodioX does not produce a lens connection adapter for Canon EOS lenses (EF/EF-S) to Nikon F camera housing: Canon connections have a diameter of 54 mm with an FFD of 44 mm, Nikon F connections have a diameter of 44 mm with an FFD of 46.5 mm. This means that a Canon EOS lens (EF/EF-S), in order to be able to focus properly on a Nikon F housing, is 2.5 mm deeper in the housing and should have a diameter of 10 mm lower to fit in the fastening flange, which the physics simply does not allow. In addition, the in -depth par.
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