Sony A7rii + Sigma MC-11 + Sigma 85 1.4 ART Aperture Noise

Started Aug 18, 2017 | Discussions thread
Jeff2013 Senior Member • Posts: 2,590
Re: Sony A7rii + Sigma MC-11 + Sigma 85 1.4 ART Aperture Noise

Yes, my Sigma 85mm ART/MC-11 makes the same sounds as yours at f1.4 and at stopped-down settings. It acts like the servo is slightly under-damped, which I assume Sigma engineers designed-in so that the focus speed would be fast. This is creates no problems, since I shoot no video with this lens and the focus is highly accurate.

One thing that I found to be important is that the focus will actually fine-tune after the beep (which is when it makes some of the sounds you are talking about). I use back-button focus so I have learned to keep my finger on the button after the focus confirmation beep. This also works well, since I typically shoot in AF-A, in case there is any subject (or photographer) movement.

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