Reasons why no Nikon 85mm f1.2?

Started Apr 11, 2013 | Discussions thread
Leonard Migliore
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Re: Reasons why no Nikon 85mm f1.2?
In reply to Michael Benveniste, Apr 13, 2013

Michael Benveniste wrote:

I don't know if any f/1.2 AF lens is feasible in Nikon mount, but I'm more uncertain that an 85mm f/1.2 would be less feasible than a 50mm f/1.2.  The "front focal length" determines the minimum needed size of the front element group, but when it comes to the rear element size the back focal length is of vastly more importance.  That's in part why rangefinder cameras have smaller lenses than SLR's.

Well, if you can do a 50mm f/1.2 you can do an 85mm f/1.2. Conceptually, think of putting a 1.7X teleconverter in front of a 50. What do you have?

In terms of the design, you have to put the pupil back at that 38mm distance. But, as you noted, there just isn't enough diameter to maintain f/1.2 in the corners of the sensor, which probably wouldn't pick up much light at that angle anyway.

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Leonard Migliore

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