brad_n Posted September 17, 2008 Share Posted September 17, 2008 My Sigma 50-500 deperately need a CLA. It back focuses. Anyone ever done this? What was your experience? Link to comment Share on other sites More sharing options...
jgredline Posted September 17, 2008 Share Posted September 17, 2008 Sigma does have very good customer service and support, but let me ask the question. Are you using spot focus? With long lenses that is a must or it will have the tendency to BF Link to comment Share on other sites More sharing options...
brad_n Posted September 17, 2008 Author Share Posted September 17, 2008 I almost always use spot focus since I am shooting birds and surrounding stuff always gets in teh way. I shot a few dozen photos last weekend and all but a couple were back focused. I saw something here about lens calibration with the K20D and thought that I might try that first. Have to go find it and read. Link to comment Share on other sites More sharing options...
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