Headline - DSLRs have imprecise focusing due to their mirrors

Started Apr 5, 2014 | Discussions thread
Lee Jay Forum Pro • Posts: 52,229
No.

Lab D wrote:

Lee Jay wrote:

conceptually, the optical paths cab be different lengths leading to consistently missed focus, and single-shot focus can be open loop.

In practice, I use closed-loop AI-servo and all of my cameras and lenses are calibrated right out of the box meaning I get 99% or so in-focus shots in the most difficult conditions. My contrast-detection cameras can't come close to matching that even with much more depth-of-field and much easier conditions.
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Lee Jay

http://www.lensrentals.com/blog/2012/08/autofocus-reality-part-3b-canon-cameras

1. Phase-detection autofocus (even using still targets and center-point only) wasn’t nearly as accurate as contrast detection.

2. The contrast-detection autofocus was about as accurate as the most careful manual focusing.

There have been many tests by unbiased sources showing Contrast Detect is usually more accurate.

As I said, I get 99% in focus with this supposedly-inaccurate technique.

And the tests done at lensrentals were with single-shot, which I don't use, as I said.

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Lee Jay

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