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<blockquote data-quote="riverside" data-source="post: 162731" data-attributes="member: 14054">I spent a great deal of time researching the same question and settled on the <a href="http://www.adorama.com/TM70300VUNK.html" target="_blank">Tamron 70-300</a>. Don't forget the Sigma you're considering doesn't have an optical stabilizer and as noted in several reviews:&quot;Impressive throughout most of its zoom range, the Sigma's sharpness drops off at the long end of the zoom range, especially towards the edges and corners of the frame. Sharpness at 300mm is poor across the whole frame with small apertures of f/16-32, which you might want to use to increase depth of field in macro shooting.Despite its APO badge, chromatic aberrations are quite noticeable. Sigma's newer, non-APO <a href="http://www.techradar.com/us/1042306" target="_blank">70-300mm OS</a> actually performs rather better in this respect. In some of our tests under dull lighting conditions, image contrast was also a bit lacking.&quot;</blockquote>

[QUOTE="riverside, post: 162731, member: 14054"] I spent a great deal of time researching the same question and settled on the [URL="http://www.adorama.com/TM70300VUNK.html"]Tamron 70-300[/URL]. Don't forget the Sigma you're considering doesn't have an optical stabilizer and as noted in several reviews: "[COLOR=#333333][FONT=Helvetica]Impressive throughout most of its zoom range, the Sigma's sharpness drops off at the long end of the zoom range, especially towards the edges and corners of the frame. Sharpness at 300mm is poor across the whole frame with small apertures of f/16-32, which you might want to use to increase depth of field in macro shooting.[/FONT][/COLOR][COLOR=#333333][FONT=Helvetica]Despite its APO badge, chromatic aberrations are quite noticeable. Sigma's newer, non-APO [URL="http://www.techradar.com/us/1042306"]70-300mm OS[/URL] actually performs rather better in this respect. In some of our tests under dull lighting conditions, image contrast was also a bit lacking."[/FONT][/COLOR] [/QUOTE]

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