Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens
I dont know hao to clean the contacts?
Pencil erasers can remove and clean, but rubber is an insulator. Don't go crazy with this, but just a bit of 91% rubbing alcohol on the end of a Q-tip applied gently to contacts will remove oxidation and improve electrical contact. Do the lenses first (I assume more than one). If this still doesn't help, then the problem is with the camera. This is a service issue (repairman). If you only have one lens, try it on another camera. Since you say "sometimes" I think cleaning will do the trick.
Posted on May 30, 2008
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Posted on Jan 02, 2017
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