Headline - DSLRs have imprecise focusing due to their mirrors

Started 6 months ago | Discussions thread
Greg A A
Contributing MemberPosts: 917
Re: Its inconvenient when facts get in the way of a hypothesis
In reply to Ontario Gone, 6 months ago

Ontario Gone wrote:

Greg A A wrote:

You are making hypothetical claims. There's no assumption in my statement. Measured results show that contrast detection isn't always more accurate than phase detection. I didn't say that phase detection was always more accurate than contrast detection. Clearly the mirror doesn't only give you imprecise focusing as this was proven with several cameras.

The point is at best PDAF will break even. It will never be more accurate, it's using distance measurements to judge. CDAF for example uses the actual sharpness of the image to judge. Think about focusing with your own eyes. Why don't you ever accidentally focus in front of or behind? Because you can sense when it's the sharpest and you stop adjusting your eye's lens, CDAF works exactly the same way.

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"Run to the light, Carol Anne. Run as fast as you can!"

The theory says one thing, measurements on real cameras show in several cases phase detect was more accurate and repeatable than contrast detect. You can theorize all you want, but actual real life measurement trump theory.

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f8 and be there

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