ef 100-400mm

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    Canon R5  R5 Ring Adapter with Canon EF 100-400mm II

    I have an R5 with an RF - EF ring adapter which I use with an EF 100-400mm f4.5-5.6 II lens, and sometimes a 1.4 x iii adapter. I am finding that when I switch the camera on it all works fine. Then, and I'm not quite sure the trigger, the ring (which is set to change aperture) stops working...

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