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Flange Distance and Mount Diameter Explained by a Lens Engineer

Nikon has understandably made a big deal about launching their new Z-mount alongside the announcement of their new mirrorless cameras, the Z6 and Z7. The Nikon F-mount was originally released 59 years ago and the company has made backward compatibility of the system a brand pillar.

But technology has changed dramatically over that time, and the release of the new system allowed Nikon engineers to effectively design a lens system without being hamstrung by history. Two key design features are a much shallower flange distance and a much larger mount diameter.

But what the heck does that mean? Nikon optical engineer and technical liason Atsushi Suzuki explains it all:

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