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The control ring is a third ring on the lens in addition to the zoom and focus rings (of course primes lack the zoom ring so they have only two rings: focus and control). The control ring typically has clicked positions, so it adjusts some camera parameter in steps. As a cost reduction measure, the RF 24-240mm superzoom lens has focus and control ring ...


2

I've experience the same issue while repairing a 5D3, it came out that the issue was caused by the top cover flat cable not properly connecting to the main board of the camera. Solved by cleaning with isopropilc alchool the flat contacts. Hope this solution might help someone in the same trouble.


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