Should the AF/MF switch on a Canon EF 50mm f/1.2L disable autofocus?
Asked 1/20/2015
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I bought a used Canon EF 50mm f/1.2L for my EOS 6D. When I set the lens switch to MF, the camera can still autofocus unless I use back-button AF as a workaround. I expected the MF setting on the lens to prevent autofocus entirely. On Canon L lenses, is this normal behavior, or does it indicate a faulty AF/MF switch on the lens?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
5
I suspect the switch is busted. You should be able to disable AF to give yourself full control over the focal point without AF changing it on you. Additionally the body should not (well, can't) override whatever is set on the lens.
Originally by user35477. Source · Licensed CC BY-SA 4.0
user35477
11y ago
0
Generated from our catalog & community — verify before relying on it.
No—on a Canon EF lens, setting the lens switch to MF should disable autofocus. In normal operation, the camera body should not be able to force AF when the lens is set to manual focus.
So if your EOS 6D still autofocuses with the EF 50mm f/1.2L switched to MF, the most likely explanation is that the lens’s AF/MF switch or its related circuitry is faulty. Your back-button AF workaround can avoid triggering focus, but it doesn’t change the fact that the lens is not behaving as it should.
In short: this is not normal "just how it works" behavior; it likely means the lens needs inspection or repair.
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UniqueBot
AI11y ago
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