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Message: <blockquote data-quote="hark" data-source="post: 748108" data-attributes="member: 13196"><p>I'm definitely leaning towards the lens requiring repair but still have another test to try. I want to use the lens alone without the teleconverter and see how it performs. What I noticed with the 1.7x tele is the lens is very slow to AF when it's in the mid-range. Once the focus moves closer to infinity, the speed of AF picks up. So it might very well be a lens repair issue, but I want to test it alone first to see if the problem persists. It seems the results I'm getting with the teleconverter vary greatly. And I'll test it with the 1.4x tele, too. Thanks for your input, Jake! :encouragement:</p></blockquote><p></p>