lwg Posted August 7, 2013 Share Posted August 7, 2013 <blockquote> <p>From reading the LensRentals dot com blog, it seems like the USB dock lets you fine tune AF calibration at set distances and zoom ranges (and presumably overall AF speed). I didn't see any indication that you could tweak the calibration per AF point.</p> </blockquote> <p>This is correct. However I found that when I used the Dock it also uploaded new firmware to the lens. I think this is what fixed the issues I was having with the outer focus points. After using the Dock and tuning the lens (about an hour of tedium) the Sigma seems dead on when used with any focus point on the D800E.</p> Link to comment Share on other sites More sharing options...
scottelly Posted October 3, 2013 Share Posted October 3, 2013 <p>I think it MUST be very good. Out of six reviews it gets a 10 average rating at SLRgear.com. That is unheard of.</p> <p>http://slrgear.com/reviews/showproduct.php/product/1561/cat/30</p> Link to comment Share on other sites More sharing options...
scottelly Posted October 3, 2013 Share Posted October 3, 2013 <p>http://slrgear.com/reviews/showproduct.php/product/1609/cat/31</p> Link to comment Share on other sites More sharing options...
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