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Aperture flicker on C70 with older Sigma 50mm f/1.4 and .71 EF to RF adapter

Gabevanlelyveld
Apprentice

Hi there,

I have the Canon C70 (latest firmware) with the Canon .71X RF to EF adapter and a Sigma DG HSM 50mm f/1.4 lens (not the newer Art version). Every once in a while the aperture will start to flicker and there is no way to make it stop except to turn of the camera. I don't know what is causing it. Lens and camera compatibility? Lens and camera plus adapter compatibility? Lens failing? Something else? To be clear, it is a manual flickering that I can see on the screen and hear happening, not the kind of flickering that comes from setting the wrong shutter speed under certain lighting conditions.

Any thoughts are very much appreciated. Thanks in advance.

-Gabe

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