In article <4kbucv$580@newsstand.cit.cornell.edu>, d_ruether@hotmail.com says...
>In article <1996Apr8.103752.1@spcvxb.spc.edu>, sherman_s@spcvxb.spc.edu
>says...

>>I am thinking of replacing my Nikkor 100-300 f5.6 lens with a Tokina
>>100-300 f4.
>>My main concern is the quality of the Tokina vs. what I have become
>>acustom to. Any info/opinion on this matter is greatly appreciated.

>Don't.
>Hope This Helps

Perhaps I should elaborate: The 100-300mm f5.6 Nikkor is really excellent center-to-corner, all focal-lengths, all apertures, and it
is unusually low in distortion (it has none over most of its range).
The Tokina is very unlikely to match this performance, for which
you will have a wider focusing aperture, and a larger and heavier
lens. If speed at all costs is the thing, get the Tokina - but
you did say that quality was important, not that the quality of
the Tokina is low.....
Hope This Helps