In article <148@turtles.win-uk.net>, ach@turtles.win-uk.net says...

>I was wondering if anyone has any comments on the relative
>performance of the old AI 80-200 F4.5 vs. the 80-200 f4 AIS?
>I've recently acquired the f4.5 model and am considering using it
>as a back-up lens to my outfit. It's beautifully built, but I've
>not yet had a chance to test its optics. The zoom collar is a bit
>loose, and before I go to the expense of having it serviced, I'd
>welcome comments on whether or not you think its worth it.

I find the f4 version a little better near the long end than the
f4.5 version, but both are excellent, assuming good samples
(I have seen little sample variation in these). Check it first,
and if good, have it serviced if the looseness is bothersome
(I would probably ignore it, especially if the lens was cheap).
Hope This Helps