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Focusing

More to be added as I gain experience with the 645D.

Initial testing suggests that the autofocus system is generally very good, but several suspicious frames suggest to me that focus errors do occur.

The 645D has a fine focus adjustment feature (custom function #33), but I found in further testing that inherent variability in focus precision makes this less useful than it might seem. I also found that depending on the direction of focus (near to far or far to near), the behavior varies in terms of the amount of error.

Example

The image below shows a tree on which focus was made at dead center. Yet the focus is well into the trunk, as can be seen by sharp bark at the periphery (the tree is very large, perhaps 4-6 feet in diameter.

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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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Pentax 645D + 55mm f/2.8 @ f/2.8, 1/4 sec, ISO 100
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