Ever wonder why Nikon doesn't have f/1.2 AF lenses and Canon does?

Started Aug 6, 2015 | Discussions thread
Matsu Senior Member • Posts: 2,398
Re: Look at the VERY thin parts on the 50mm f/1.2 AI-S.

Rexgig0 wrote:

Parts apparently have to be very, very thin at the mount, including the finger-like part that engages the metering system, and the metal end of the mount, itself, on an f/1.2 lens. Keep in mind that I am not an engineer, just judging by eye. The glass element, too, seems quite vulnerable, as it protrudes from the mount.

"E" lenses would, seemingly, be easier to engineer if built with f/1.2 maximum aperture, but again, I am not an engineer.

The f mount is almost certainly not limiting the maximum aperture of the lens.  Bigger apertures than even f/1 have gone through it, and with longer focal lengths than 58mm

See here


Now none of these are AF, and all are converted, fixed aperture designs, but the mount isn't restricting the aperture.

A big aperture doesn't necessarily have to have a directly proportional rear element depending the design.

With both AF and aperture controls being though electronic contacts, there are no physical limitations, but that doesn't make it necessarily practical to do.

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