Question about Canon 75-300mm f/4-5.6 III USM EF Lens

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M/A focas switch

I have older canon 75-300 zoom lens and the button (M/A) focus switch has come off...been searching to parts manual, but not real handy on line...know where I can get a replacement switch and can I replace it myself? Baffled in Iowa Thanks

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Here is Canon's number info: For toll-free technical support, please call 1 (800) 828-4040 during regular business hours (currently Monday-Friday 8:00 a.m. - 12:00 midnight. EST, Saturday 10:00 a.m. - 8:00 p.m., excluding holidays).

You should be able to replace it yourself, no tools required

Posted on Jan 02, 2008

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Posted on Jan 02, 2017

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Zoom problem


Ive seen this three times and everytime its been something differant. Fist was the rocker switch was jammed. easy fix as dirt was in there. Second was a small serface maounted capacitor in the zoom interface circuit. An third never found the problem as we thought it was a limit switch in the lens itself but the customer never paid for a new lens assy so we didnt order it. Good luck

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