Christa Binder Posted August 21, 2008 Share Posted August 21, 2008 I have a Tamron 75-300 lens that will not auto focus anymore. When I try to Auto focus on a subject, the lens just keeps searching, but never finds focus. I cant seem to manually focus it either. My other lenses which are Canons, are working fine, on my Camera, which is a Rebel xt. Is this a compatability problem with my Canon, or is it just the lens itself? I believe I have lost the receipt, so I dont think I will be taking it back. I have only had this lens for a couple of months. Before the lens stoped focusing, I did get a couple of error 99s. Does anybody have any suggestions or advice, before I give up on it? Thanks in advance. Link to comment Share on other sites More sharing options...
Christa Binder Posted August 21, 2008 Author Share Posted August 21, 2008 type o, the lens is a 70-300. Link to comment Share on other sites More sharing options...
geoffs1 Posted August 21, 2008 Share Posted August 21, 2008 I'd try cleaning the contacts on the lens-mount. The ERR 99 is often caused by communication problems between the body and lens - that could also cause focus problems, too. Link to comment Share on other sites More sharing options...
Christa Binder Posted August 21, 2008 Author Share Posted August 21, 2008 Hi Geoff, what is the best way to clean the contacts? I am fairly new to all of this. Thanks for your suggestion, I will try it. Link to comment Share on other sites More sharing options...
geoffs1 Posted August 21, 2008 Share Posted August 21, 2008 "...what is the best way to clean the contacts?" I tend to use a lint-free PEC-pad and some high-purity Ethanol (basically the same gear as wet sensor cleaning). That's probably a bit conservative. I've cleaned many non-camera electronic contacts with a clean, soft pencil eraser. I'm a bit hesitant to try than around the optics and fine mechanism of my lens/camera for fear of getting crumbs into the mechanism (but I think others recommend it). Hopefully someone with more experience cleaning lens/camera contacts can give mroe specific advice. Link to comment Share on other sites More sharing options...
mattblalock Posted August 21, 2008 Share Posted August 21, 2008 Its not as serious as Geoff makes it sound, just take an eraser to the little metal contacts on both the camera and the lens. Be careful with where the rubber droppings go as you "erase". I used to get that same error on the same lens and body and often had tons of trouble focusing. Clean her up a bit. I'll follow the thread, if you still have trouble just post back here. Matt Link to comment Share on other sites More sharing options...
geoffs1 Posted August 21, 2008 Share Posted August 21, 2008 Matt Blalock, "Its not as serious as Geoff makes it sound" For sure; I'm just a "Nervous Nellie" about that kind of stuff (although I have no problems brushing and swabbing a sensor - go figure...) Link to comment Share on other sites More sharing options...
Christa Binder Posted August 22, 2008 Author Share Posted August 22, 2008 Hello Geoff and Matt I appreciate your help, I did clean the contacts, but still no luck, if you think of anything else let me know. Thanks again. Link to comment Share on other sites More sharing options...
geoffs1 Posted August 23, 2008 Share Posted August 23, 2008 I think it may be time for a trip back to Canon... It should be a warranty repair, at least... Link to comment Share on other sites More sharing options...
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