Originally Posted by colyn
If the lens is marked Nikkor-S it is a 7 element.I believe newer versions of the non-AI were also 7 element.
Yep, it is a Nikkor-S. I know that Canon used a 7 element design, in 6 groups, for the FD 50/1.4. I wonder if the Nikkor's similar.
And I didn't know that a sonnar-design couldn't be adapted to a SLR.