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Canon 5D Mark III
Canon 5D Mark III

Focus Accuracy (Green Dot Assist)

Manually focusing the Canon 5D Mark III is somewhat problematic.

The non-replaceable focusing screen of the 5DM3 is not conducive to focusing an f/1.4 or f/2 lens (and perhaps not even f/2.8), which I quickly found out in focusing by eye— hit or miss accuracy, with mostly misses, using the Zeiss 100/2 and 35/1.4 and Leica 90/2 APO. Those images are not presented here because they were mostly out of focus enough to make a summary judgment on viability.

This page shows what can be expected using the Canon green dot focus assist (autofocus assist in manual mode).

Canon focus assist (green dot AF assist)

The Canon AF assist mode is partially brain-dead; it works ONLY with “chipped” lenses, which means Canon EF lenses, Zeiss ZE lenses and Tamron, Sigma, etc lenses designed and chipped for Canon EF mount.

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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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ƒ/2 @ 1/2500 sec handheld, ISO 100
Canon 5D Mark III + Zeiss 100mm f/2 Makro-Planar
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