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That grinding is the infinity focus motor on your lens moving while attached to the adapter. It's a common complaint with the adapter. I think it has to do with the fact that some RF glass doesn't have infinity focus and the camera wasn't designed for it? It's annoying but so far in my use, it hasn't been a major issue.
Sorry, there was a problem. Please try again later.Sorry to hear that. It works great with my 55-250 mm lens.
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