A77m2 Telephoto advice
I currently have a a77mk2 with the 16-50mm 2.8 kit and love it!
I have been meaning to purchase the Tamron SP 70-300 for around $520 new (NZ) but just found a near new Sigma 70-200/2.8 EX APO HSM DG OS selling for around $850.
I have read reviews for both lenses and have seen very good comments with regards to the tamron
However with all the reviews about the sigma, the comments only compare the lens to similar constant aperture lenses.
Does anyone have any first hand experience with the Sigma?
Does constant aperture mean a far better IQ lens? Or do the two lenses serve completely different purposes?