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23mm F2 AF and MF grinding noise


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Hello, so yesterday after returning from the "photo shoot" I started to hear a loud grinding of the focus motor in both AF and MF. I also felt and still feel some vibrations in both modes. When I have loosened the UV filter it got quieter but it's still here. It is very similar to the noise in this movie (0.41s - 0.53s and 2.37s - 2.47s). The lens is still under warranty, but I don't know if I should worry about it. It's definitely weird, but AF and MF work fine (I think it works the same as before). 


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