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Focusing Accuracy with 85mm f/1.2L II

The Canon 1D X has Canon’s latest generation autofocus technology, so I decided to put it to the most important test to me: can the camera “nail” the focus at ƒ/1.2 at various distances and a variety of subject matter under differing lighting conditions?

I do not expect perfection from any autofocus system, and there are some subjects that are ambiguous even to the human eye (where to focus exactly), but the key is can the camera get it right in the non-ambiguous cases most of the time?

At ƒ/1.2, there is no margin for error.

As this test is all about focus accuracy and the subject matter was purely ad-hoc (of no artistic merit), the images shown here are all actual pixels crops at the point of focus.

Grapes

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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Canon 1D X + 85mm f/1.2L II @ ƒ/1.2, actual pixels
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