> I notice a few people posting that they are looking for a > constant aperture auto focus zoom available in a Pentax > mount, that is around the 28-70mm (or 28-80, 28-75, 24-70, > 24-90, 28-105 etc) mark. So, I was wondering - aside from > the Pentax FA 28-70 f2.8, which lens is generally thought of > as the "best" in or around this range?
I just got the Sigma 28-105 f2.8. I haven't done or seen any sharpness tests on it, but all the shots I've gotten from it look great and it focuses quickly. I really enjoy having that extra 30mm over the 28-70mm lenses. Only problem is that it sometimes flares a bit on the wide end. It's a great lens paired with the istD.
