Amita, Haven't used it, as it wasn't out for Pentax initially (only Canon/Nikon), but I do have the 28-75 DI Tamron which came out just before this one. The 28-75 is a great lens and is very sharp for a zoom. Testing against my FA 50/1.4 and Tamron 90/2.8 SP Macro, I can tell you that it is NOT as sharp as those primes, but very good nonetheless.
Personally, after using and then buying the DA 16-45, that is the route that I would go. It is slightly wider and slightly longer and has the focus clutch and at least on the *istD, performed better than the FA*24/2 that I used to own. It is a marvelous lens. I have not heard on the web much clamoring at all about the Tamron - even though I have heard tons about the 28-75 Tamron that I have. I have also heard from almost all owners of the DA 16-45 that it is truly a great lens, optically. I would be quite surprised if the Tamron was as good. Anyway, my 0.02 worth, HTH. Bruce Monday, October 25, 2004, 5:33:53 PM, you wrote: >> AF Tamson SP 17-35-2.8-4. >> >> Alan Chan >> http://www.pbase.com/wlachan AG> Alan, do you have any experience with this lens? Does anyone? Nate almost AG> has me sold on this one, since it's full frame and apparently it's supposed AG> to be even better than some primes, but I'd like to hear from others who AG> have used it. AG> Amita