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Help! Sigma Lens won’t manually focus

It sounds like the 'AF/M' (autofocus/manual) switch on the lens has stopped working. Short of having the lens repaired, there are a few workarounds you can try. Back Button AF On In the 60D's "...
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Sigma 60-600mm is never sharp whatever the aperture

An other answer could be the lens hood as explained in this video.
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