Reasons why no Nikon 85mm f1.2?

Started Apr 11, 2013 | Discussions thread
Leonard Migliore
Leonard Migliore Forum Pro • Posts: 15,579
Re: Reasons why no Nikon 85mm f1.2?

Photo Thoughts wrote:

You'd have an 85mm, but not f/1.2.

Yes you would. Note that I said the teleconverter goes in front of the 50mm f/1.2. The configuration of such a converter is a 1.7X afocal telescope; such devices do not affect the f/stop of the system. Teleconverters that go between the lens and the sensor do, indeed, affect the f/stop.

My comment was only for conceptual purposes to show that if you can make a 50mm f/1.2 you can make an f/1.2 at any focal length. A hypothetical 85mm f/1.2 would be designed so that the exit pupil was 38mm from the sensor because that's where you can make it the largest (diameter of 32mm).

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Leonard Migliore

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