Jon Cream of the Crop  69,628 posts Likes: 227 Joined Jun 2004 Location: Bethesda, MD USA More info | Jun 04, 2011 20:12 | #16 Back to the original problem - which focal lengths is it giving you trouble with. The 100-400L is apparently (mine doesn't seem to be with my B+W MRCs, but others have reported trouble) sensitive to filters so has trouble with AF and IQ at longer lengths. Jon
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dan.k78 THREAD STARTER Senior Member  426 posts Likes: 14 Joined Mar 2009 Location: Cheektowaga, New York More info | Jun 05, 2011 11:18 | #17 The issue is that it thinks it found focus, but it isn't. Today is nice and sunny, so I'm gonna experiment a little more. Thanks for the help so far Gear: 5DIII; 6D; Canon 16-35 f/4L; Canon 24-70II f/2.8L, Tamron 70-200mm f/2.8 VC; Sigma 35mm f/1.4A; Sigma 105mm f/2.8 Macro; Phottix Mitros+;580exii; Metz AF 50-1
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