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TC mount release switch sticking

Started 9 months ago | Discussions thread
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Tom59 Senior Member • Posts: 1,651
TC mount release switch sticking

As title states, the release tab on my 1.4 mk3 tc is sticking. It is hard to release and does not always lock when installing. Have to play with it to get it to lock now. Repeats on multiple lenses so I believe its the tc.  Almost dropped my 500 f4!!!  Any thoughts on how to fix? Leary of using small drop of oil fearing may creep inside?  Thanks

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Canon EOS 6D Canon EOS 7D Mark II Canon EOS 80D Canon EOS 5D Mark IV Canon EF 70-200mm F2.8L IS II USM +3 more
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