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<blockquote data-quote="Horoscope Fish" data-source="post: 593143" data-attributes="member: 13090">Well Sigma lenses are a little different in that AF adjustments are stored in firmware of the lens itself, not on the camera body like a Nikon lens. Sigma lenses also allow for tuning the AF at four different distances meaning you have four different adjustments to make and from speaking to others who use this lens, having the AF dialed in accurately at all four points is what really allows this lens to perform at its full potential. So yeah, while I don't mind doing a little AF fine-tuning I also think it's a bit of a PITA to set everything up and perform the calibration for one setting, much less four. I work full-time and would rather be shooting than fiddling with AF calibration. Finding out Sigma would perform the service for free pushed me off the fence and I decided to let the factory do it for me. The quick turn around and free return shipping were just pleasant surprises.....And I expect a full and in-depth report, post-haste, my good man......</blockquote>

[QUOTE="Horoscope Fish, post: 593143, member: 13090"] Well Sigma lenses are a little different in that AF adjustments are stored in firmware of the lens itself, not on the camera body like a Nikon lens. Sigma lenses also allow for tuning the AF at [I]four[/I] different distances meaning you have four different adjustments to make and from speaking to others who use this lens, having the AF dialed in accurately at all four points is what really allows this lens to perform at its full potential. So yeah, while I don't mind doing a little AF fine-tuning I also think it's a bit of a PITA to set everything up and perform the calibration for one setting, much less four. I work full-time and would rather be shooting than fiddling with AF calibration. Finding out Sigma would perform the service for free pushed me off the fence and I decided to let the factory do it for me. The quick turn around and free return shipping were just pleasant surprises. [COLOR="#FFFFFF"]....[/COLOR] And I expect a full and in-depth report, post-haste, my good man. [COLOR="#FFFFFF"].....[/COLOR] [/QUOTE]

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