In article <4e89a8$223@ns2.ptd.net>, fmb42@postoffice.ptd.net says...
(about Tamron vs. Sigma)
>I have the Nikon F3HP. I would like some advice as to which one
>would be better. I am interested in a 28-70.

Hmmm, why not put a GOOD lens on an F3HP - try a Nikkor, even if used!
(Sorry, just couldn't resist - I have never figured out why people
buy expensive bodies, and put junky lenses on them. Better, I think,
to go the other way around, putting good glass on an older, cheaper
body...., but, maybe I am missing something here......)
Hope This Helps