JSK wrote in message <665psm$h4t$1@madmax.keyway.net>...

>I am in the market for Nikon 105mm f2.5 lens as I have heard many good
>comments.
>
>The problem is that I am not sure which version of this lens I should be
>looking for. By Dejanew search I have found out that I should be looking for
>one with large rear element but not having seen both it is hard to determine
>which is which. I am hoping someone with the lens can actually tell me the
>measurement of the element.
>
>Also, which mount should I be looking for? I am using F2 with unmetered
>prism finder so I do not require AI lens. I have seen Nikkor Auto-P(non AI
>with metal focusing ring), Nikkor Auto(still non AI with rubber ring) and
>AIS. Is there a Nikon expert like David Ruether out there who has the
>answer? Please email me and post the copy. Thanks in advance.

Gee, with a request like that, how can I resist answering...? ;-)
The answer about the mount type is easy - any Nikkor will fit your
camera (in fact, ALL Nikkors ever made will fit your non-metered F2!).
As to the first, the difference is so striking in the appearance of the
105mm f2.5 rear elements that seeing either one it will be obvious which
you have! (The later one has the largest rear element imaginable that
would still fit inside the bayonette - the earlier has a rather
surprisingly small rear element given the speed and FL of the
lens...) BTW, don't overlook the really excellent 100mm f2.8
E-Series Nikkor - it is close to the best optically, and
generally very inexpensive. The 75-150mm f3.5 E
is also first-rate...
Hope This Helps
David Ruether - http://www.fcinet.com/ruether