Question about Canon EF-S 17-85mm f/4-5.6 IS USM for EOS 20D, Rebel Series

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17 to 85 EFS IS lens with issues. Auto focus bounces back and forth and wont lock in. When it does work, Im getting intermittent error message saying that lens and camera body are not communcating.

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It has lens communication problem either it can be giving by lens main pcb or diapharm unit.
you can open lens rear cover and clean all main pcb connection with iso lequid or fiber pen and then put it back all things back and try with body if its work then problem is solw
if not then nned to replace main pcb first and try i think it can be solw the problem.
other wise you have to replce lens shutter unit.

Posted on Aug 30, 2010

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It seems to me that you are in one of the modes where the camera is controlling the settings.
What do you mean when you say "Back the lens off?"

Please turn the camera off and then on again.
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