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<blockquote data-quote="BeerBelly" data-source="post: 599645" data-attributes="member: 35439">The thing about the 150-600 zooms with variable apertures are the values the lens sends back to the body when conveying data. It cheats a little bit and presents the actual aperture of f6.3 as f5.6. This happens for two reasons:1) to allow phase AF on older bodies that do not have the capability to AF at F8;2) to allow the use of TCs on newer bodies that do have this capabilityThis is also the reason why some bodies underexpose a bit on these lenses.That said, I think these lenses are a true revelation when it comes to wildlife photography. They are an &quot;affordable&quot; way of getting to 600mm, while providing excellent IQ along the way. Sure, the exotic primes provide even better IQ, but for hobbyists and amateurs they are a dream come true. I would say the biggest difference between them is copy variation. They are all adequately sharp (with the Sigma 150-600 Sports and Tamron 150-600 G2 leading the way), but what is important is also how they will be used. For handholding...I would probably rule out the Sigma 150-600 Sports (at 3 kilos it's a lot to handle) and go with the G2 Tamron most likely.</blockquote>

[QUOTE="BeerBelly, post: 599645, member: 35439"] The thing about the 150-600 zooms with variable apertures are the values the lens sends back to the body when conveying data. It cheats a little bit and presents the actual aperture of f6.3 as f5.6. This happens for two reasons: 1) to allow phase AF on older bodies that do not have the capability to AF at F8; 2) to allow the use of TCs on newer bodies that do have this capability This is also the reason why some bodies underexpose a bit on these lenses. That said, I think these lenses are a true revelation when it comes to wildlife photography. They are an "affordable" way of getting to 600mm, while providing excellent IQ along the way. Sure, the exotic primes provide even better IQ, but for hobbyists and amateurs they are a dream come true. I would say the biggest difference between them is copy variation. They are all adequately sharp (with the Sigma 150-600 Sports and Tamron 150-600 G2 leading the way), but what is important is also how they will be used. For handholding...I would probably rule out the Sigma 150-600 Sports (at 3 kilos it's a lot to handle) and go with the G2 Tamron most likely. [/QUOTE]

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