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Loss of light with NAM-1 adaptor?

 
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jrsamples



Joined: 24 Feb 2010
Posts: 11
PostPosted: Thu Apr 01, 2010 5:39 pm    Post subject: Loss of light with NAM-1 adaptor? Reply with quote
Is there any stop loss of light using this adapter? Or does light transfer as a native lens to n-mount.
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conurus
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Joined: 15 Aug 2006
Posts: 718
Location: Vancouver, Canada
PostPosted: Thu Apr 01, 2010 11:49 pm    Post subject: Reply with quote
There are no optical elements, no loss of light, no change in focal length, no change in aperture. A Contax 645 80mm f/2.0 remains a 80mm f/2.0 on a Canon.

The angle of view does change, as expected - a 80/2 is a normal lens in 645 format and becomes a short telephoto on a full frame DSLR. The angle of view becomes smaller because you are capturing just the center portion of the image circle with a full frame DSLR.
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