Question about Canon 75-300mm f/4-5.6 III USM EF Lens
The apeture is stuck closed. Maybe at f/22. How can I get into this lens to repair it? Is there a free online repair manual?
Mine had the same problem. The electric flexible wire that links to the moving aperture motor in the center is most likely broken, causing the aperture to stop reopen after a shot. this could be proved if you feel something touching inside when zoom. (that is caused by the loose flexible wire, if so do not zoom anymore, you could further damage the wire) It need to be replaced and this requires the complete disassmebly of the lens. I repaired mine myself by adding a thin wire, took me more than 10 hours in total (first tear it apert, pin point the problem, then think of a solution because I did not have the parts for repair, then finally repaired it). If you have never done lens/electronic repair before, don't do that, too many tricks that could lead to further damage.
Posted on Jun 07, 2008
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Posted on Jan 02, 2017
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