Sigma 18-35 + MC-11 Canon Mount Auto Focus Noise

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paul wassermann Regular Member • Posts: 425
Sigma 18-35 + MC-11 Canon Mount Auto Focus Noise

When used with MC-11 adapter, I have really disturbing AF noise and I can feel a thunking sensation as the lens attempts to focus.  When I put the lens on a Canon body, perfect focusing, no tactile or  significant audible noise.  Adapter works fine with Sigma 24-105.  Problem the same on both A7rII and A6500.  Any thoughts?  Is this just what happens or is something defective in the lens/adapter/body combination?

 paul wassermann's gear list:paul wassermann's gear list
Sony Cyber-shot DSC-RX10 Sony a6500 Sony Alpha a7 III Sony Carl Zeiss Planar T* 50mm F1.4 ZA SSM Sony FE 35mm F2.8 +9 more
Sony a6500
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