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<blockquote data-quote="hark" data-source="post: 761471" data-attributes="member: 13196"><p>I went back out to test the sharpness of the AF - unfortunately these were all in very shaded areas so I hit my capped ISO limit and wound up having to increase my exposure during post. But the bird photo (which was by far the most underexposed image) still shows detail. So it seems the AF is affected only at long distances which is the same issue I had when I sent this lens in for repair the first time.</p><p></p><p>Lousy color with this first one, but it's only a test. I did adjust the noise, but the file was incredibly underexposed. What's important for me is there is visible feather detail. It was so dark in the woods that I had to focus manually before the AF would kick in. Without focusing manually, the AF just hunted.</p><p></p><p>The thing is all of these subjects were close. None were anywhere near as far as the vulture or hawk. Also tested with VR on with lower shutter speeds and VR off with higher shutter speeds. No difference there though. </p><p></p><p>[ATTACH=full]358220[/ATTACH]</p><p></p><p>[ATTACH=full]358221[/ATTACH]</p><p></p><p>[ATTACH=full]358222[/ATTACH]</p></blockquote><p></p>
[QUOTE="hark, post: 761471, member: 13196"] I went back out to test the sharpness of the AF - unfortunately these were all in very shaded areas so I hit my capped ISO limit and wound up having to increase my exposure during post. But the bird photo (which was by far the most underexposed image) still shows detail. So it seems the AF is affected only at long distances which is the same issue I had when I sent this lens in for repair the first time. Lousy color with this first one, but it's only a test. I did adjust the noise, but the file was incredibly underexposed. What's important for me is there is visible feather detail. It was so dark in the woods that I had to focus manually before the AF would kick in. Without focusing manually, the AF just hunted. The thing is all of these subjects were close. None were anywhere near as far as the vulture or hawk. Also tested with VR on with lower shutter speeds and VR off with higher shutter speeds. No difference there though. [ATTACH type="full" width="60%"]358220._xfImport[/ATTACH] [ATTACH type="full" width="60%"]358221._xfImport[/ATTACH] [ATTACH type="full" width="60%"]358222._xfImport[/ATTACH] [/QUOTE]
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