Why No Nikon f1.2 G Lenses?

Started Feb 11, 2013 | Discussions thread
heptagon Regular Member • Posts: 191
Re: Then 400mm f/2.8 would require 142.85mm wide mount

inasir1971 wrote:

whoosh1 wrote:

If mount needed to be wide (as opposed to the front element) - then 400mm f/2.8 & 800mm f/5.6 would need 143mm wide mounts which both Canon & Nikon do not have. Yet they have those lenses! In fact Nikon 600mm f/4 would need 150mm mount. If you see the specs the diameter - and I guess the front element is 166mm:


So I don't see the narrower mount as the reason for not having f/1.2 lens.

brightcolours wrote:

I am not totally sure a 85mm f1.2 is doable for Nikon, the F-mount is a LOT more narrow than the EOS mount.

I think the issue is regarding the space around the sensor in the mirror box which can clip the light cone as in this example:

(image from a Canon 85/1.2 by Mike Nunan from article on bokeh here)

Observe the clipping of the bokeh highlights - the straight edge.

Nikon primes also have this problem but it is a lot more serious with Canon's 50mm f1.2, 85mm f1.2 and 200mm f1.8, and drastically bad with Canon's 50mm f1.0.

 heptagon's gear list:heptagon's gear list
Nikon D4 Nikon AF-S Nikkor 24-70mm f/2.8G ED
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