In article , walter@zaiko.kyushu-u.ac.jp says...
>In article <4gdki9$82b@newsstand.cit.cornell.edu> d_ruether@hotmail.com (Bob >Neuman) writes:

>>The 24mm f2.8 optics have not been changed since their introduction
>>as non-AI lenses with the knurled metal focus ring except for the
>>addition of multicoating many years ago. They all have
>>floating-element design ("CRC"), as do most Nikkor wides.
>>Hope This Helps

>This is not completely correct! The C and K version (1975-1977) of the >Nikkor 24mm/2.8 had also different lens design.

I think you are correct - this one slipped by me! Sorry!
Hope This Helps