skieur
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Which one of these lenses has higher quality glass, and produce the best images? I'm aware that they have different focal lengths, I was just curious as to which one's image quality is better. The Sigma is $300 more than the Tamron, but its focal lengths are much longer. Your insight is appreciated.
Well, you are talking apples and oranges since the focal length is NOT the same. The tamron 70mm to 200mm 2.8 has excellent IQ throughout its range according to Popular Photography but users complain about its less than fast, effective, autofocus. The Sigma 70mm to 200mm has better autofocu but the IQ reduces as it goes out beyond 100 to 200mm to very good...again according to Popular Photography.
So check the autofocus on your tamron consideration, as well as the tested IQ.
skieur