Originally posted by EddyinGA Of these three third party manufacturers...
Which do you think produces the best/Highest Quality? And, why?
I'd say that all of these companies produce OK, good and excellent lenses. I've owned two Sigma's (one which I still have) and neither was/is very satisfactory. But!!! The two lenses are consumer grade lenses. I have a friend who swears by his 17-70 Sigma, and he gets very good pictures with it. But!!! it's not a consumer lens. I love my 90mm f2.8 Tamron macro, one of my favorite lenses, and would buy a Tamron lens again in a second, but not a consumer grade lens. It would have to be a mid tier or top shelf Tamron. Same with Sigma, Tokina and even Pentax. Tho I must admit that I have been happy with the 18-55 'kit' Pentax lens, but there are others who haven't had as good an experience with that lens.
What I'm trying to say with all these words is that any of these companies produce good and excellent glass, but you gotta pay for it...same as with Pentax.
NaCl(not the manufacturer, but the quality level within the manufacturer)H2O