Focus not very accurate with single AF

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Marc dbr
Marc dbr Regular Member • Posts: 261
Focus not very accurate with single AF

Hi all,

I recently purchased a 135 f2 L lens and so far it is an amazing piece of kit. I mainly used the lens with AI servo with 4 helping cross type points and that works amazingly well. But I started using it more and more with Single AF and noticed a weird behavior, my 5D 3 tends to front focus then...

Why is that, is it common with fast lenses when used wide open? Is there less accuracy?

 Marc dbr's gear list:Marc dbr's gear list
Canon EOS 5D Mark III Canon EF 135mm F2L USM Canon EF 16-35mm F4L IS USM Canon EF 100-400mm F4.5-5.6L IS II Phase One Capture One Pro +1 more
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