Originally posted by slip Is the tammy 70-200 2.8 AF as slow as reviews tell me? They say the Tammy has superior optics compared to the sigma 70-200 2.8 but the sigma
Who is "they"? I have had all three of the lenses discussed here [Sig 70~200, Pen 50~135, Tam 70~200] with the Tamron being one of my quickest "in and out" of the arsenal lenses - it is a good piece but the absence of HSM/USM/SDM did it in for me, with it being screw drive AF there is no "quick shift focus" and you can't use "CIF" with this lens, huge deal buster for the type of shooting I do. The sharpness of the Tamron is pretty good, not as good as the Sigma 70~200 OS FLD though. The 50~135 is the real deal if you are looking for a zoom type portrait lens, IMO it is the best zoom type portrait lens offered by pentax; if you have to get the extra range as in a 70~200 and you are not on a tight budget, the Sigma OS FLD is the best option...