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Message: <blockquote data-quote="J-see" data-source="post: 402156" data-attributes="member: 31330">I'm not sure what exactly the problem is (or how you can cause damage unless you try to use both simultaneously) but I can manually adjust the focus ring whenever I want (unless the lens prevents it). It won't work when you have auto-focus set to the trigger since then each time you shoot, the AF kicks into action when it is half-pressed.I use back-button focus which enables me to focus with the one button while taking the shot with the other. I'm not sure if I had to disable it only shooting when in focus. It should work pretty similar on yours.</blockquote>