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11-06-2007, 08:42 AM   #1
Forum Member

Join Date: Oct 2007
Location: Memphis, TN
Posts: 82
Compare 70-300mm AF lenses

I'm in the market for something a little longer than my Pentax FA 80-200mm for bird photography. My camera is a K100d. The two lenses below seem to fit the bill for a reasonable (under 200 USD) price.

Sigma 70-300mm f4-5.6 DG APO (around $200)
Tamron 70-300mm f4-5.6 DI

I'm asking for recommendations and clarification. I understand both the Sigma and the Tamron are totally auto focus and auto exposure with my K100? Also, though not a Need, macro capability is a Want.

I'm also curious as to which lens is more prevalent among the forum members.

11-06-2007, 09:36 AM   #2
Senior Member

Join Date: Sep 2006
Posts: 181
I have owned both, and like the Sigma the best. I think the build quality of the Sigma is superior, the Tamron just feels like a cheap plastic toy to me, not that the Sigma is that much better. Image quality wise, there is not much difference. Both need to be stopped down to at least f8 at the long end for good image quality. I also think the Sigma preforms better in the 1:2 macro range than the Tamron.

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70-300mm, auto, f4-5.6, k-mount, lenses, pentax lens, sigma, slr lens, tamron
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