MC-11 w/ Tamron 70-200 makes grinding sound when changing aperture. Is that normal?

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YakMan04 New Member • Posts: 1
MC-11 w/ Tamron 70-200 makes grinding sound when changing aperture. Is that normal?

I just received my tamron 70-200 G2 with MC-11 on my Sony A7iii. When I manually adjust the aperture, I hear a grinding/scrathing sound. When I watch the footage, when I am changing aperture, the screen flashes brightly as I change aperture.

Help!!

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Sony Alpha a7 III Tamron SP 70-200 F2.8 G2
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