Reasons why no Nikon 85mm f1.2?

Started Apr 11, 2013 | Discussions thread
Hugowolf
Forum ProPosts: 11,194
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Re: Not convincing - nt
In reply to cosmicnode, Apr 14, 2013

cosmicnode wrote:

whoosh1 wrote:

Think this is an internet myth.

Grevture wrote:

whoosh1 wrote:

Other than hearsay.

Leonard Migliore wrote:

The mount's not big enough.

There's a discussion here about putting a CPU chip on a 50mm f/1.2 AI-S Nikkor and it was noted that you have to grind a piece off the rear element to get space for the contacts.

Take a look at this image and see how hard it is even with the wider EF mount ...

The rearmost lens element is so large the contacts has to invade into it.

It look's almost as if the rear elements on both lenses are flat. could this be only a protective rear filter which would not actually be the required rear element diameter ?.

A lens doesn't have to be curved on both faces. Lenses can be plano-concave or plano-convex as is the rear element of the Canon  85 f/1.2L.

Have a look at the block diagram for the Canon:
http://www.canon.com/camera-museum/camera/lens/ef/data/standard/2006_ef_85_f1.2lII_usm.html?p=2

But yes, the Nikon f.1.4 does seem to have flat glass at the rear:
http://www.nikonusa.com/en/Nikon-Products/Product/Camera-Lenses/1933/AF-NIKKOR-85mm-f%252F1.4D-IF.html#lightbox/media=/Misc/lo_1933_AF-NIKKOR-85mm-f-1.4D_Construction.jpg

Brian A

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