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03-19-2014, 01:52 PM   #331
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QuoteOriginally posted by froeschle Quote
IIRC, Nikon AI lenses without CPU "communicate" only "mechanically" (like the K/M lenses + all lenses with aperture ring not set to the "A" position) and not "electronically" (like the A lenses + all lenses with aperture ring set to the "A" position). Thus, for this functionality, something similar as an aperture coupler had to be integrated.
http://www.throughthefmount.com/articles-back-olderlenses-dslr-8.jpg
However, several things are bit more complicated regarding the Nikon mount, as e.g. some coupling takes place "outside" the mount.
Yeah right, but AI-S is 1982. Pentax A lenses is 1983.
What more do you need?

03-19-2014, 02:30 PM   #332
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Irrespective of the year (1977?), the effort taken by Nikon today is still more "serious", imho.

Nikon F-mount - Wikipedia, the free encyclopedia
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