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03-13-2013, 07:49 PM   #31
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QuoteOriginally posted by ivanvernon Quote
The Sigma does in fact have a constant 2.8 aperture. See the comparison between the three competitive lens, Sigma, Tamron, and Pentax:

DA* 16-50mm vs. Sigma and Tamron 17-50mm F2.8 Comparison - Introduction -

The Tamron, by the way, comes out very well in this comparative review, and this is one reason I decided to buy my Tammy 17-50.
I though dannydza was asking about the Sigma 17-70...which is much cheaper than the one in the review.


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