atexasphotog Goldmember  More info | Jan 14, 2015 15:36 | #1 Starting to have issues with my lens while in AF mode. The lens is not focusing periodically. No codes are showing up. I first noticed it while shooting a C130 doing touch and go's in Arizona... seems to work fine in MF... thought it might have been due to the plane's movement but acted up whilst focusing on a stationary object too Canon 6D,T3i, Powershot G16| 50mm 1.8II|100-400mm F4.5-5.6L|24-105 IS F/4 L||16-35mm F/2.8 vIIL|lCanon 1.4x mkII TC|580 EXII |Keeping it all in a KATA Backpack
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Trvlr323 Goldmember  3,318 posts Likes: 1091 Joined Apr 2007 More info | Jan 14, 2015 16:01 | #2 If your IS is turned on? Does the focus jump or become jittery before locking? If so it might be your IS malfunctioning. Try turning it off and see what happens. Sometimes not taking a photograph can be as problematic as taking one. - Alex Webb
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