STM on a 5D3

Started Dec 24, 2012 | Discussions thread
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STM on a 5D3
Dec 24, 2012

I occasionally use my 5D3 for video and, once or twice, tried to refocus while taking a video by using the AF button. Once or twice was enough because of both the noise that the 5D3/24-105 combination makes when refocusing and the lack of smoothness during the refocusing period. I either have to remove that secion from the video or live with the transition in the videos.

I have been wondering if the 40mm STM lens, which I understand was designed for video refocusing, would work decently on a camera like the 5D3. Has anyone tried this?

And, if so, is the 5D3/40mm STM quieter during refocusing than a "normal" lens? And is the refocusing "smoother"? Or does the STM lens only work properly with a camera designed for it like the t4i?

I would prefer to know before buying the lens. It is not expensive but US $150 is still $150 and, if the lens does not work quietly and smoothly enough on a 5D3 to take videos with, then I should use the money for something else instead. Any help would be appreciated.


Canon EOS 5D Mark III Canon EOS Rebel T4i (EOS 650D / EOS Kiss X6i)
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