DA* 16-50mm vs. Sigma and Tamron 17-50mm F2.8 Comparison Review - Introduction | PentaxForums.com Reviews (Mobile)
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Sigma 17-50mm f2.8 as good as primes? - Page 4 - PentaxForums.com
![SIGMA 17-70mm F2.8-4.5 DC MACRO For PENTAX KAF(AF Coupler) Japan [TOP MINT] | eBay](https://i.ebayimg.com/images/g/FPsAAOSwlDBiLqj-/s-l1200.jpg "SIGMA 17-70mm F2.8-4.5 DC MACRO For PENTAX KAF(AF Coupler) Japan [TOP MINT] | eBay")