Epson's new EVF--brave new world?

Started Oct 15, 2009 | Discussions thread
Lee Jay Forum Pro • Posts: 52,333
Re: the E-P1 is the cute and popular baby of the Olympus m4/3 family

BJL wrote:

As CDAF speed is a lot to do with algorithms and processing speed, I expect good progress on that front.

It's also dependent on sample speed, and that is the primary limitation. To find the in-focus position, PD AF needs one sample from a sensor that runs at hundreds of Hz. CD AF needs many samples from the main sensor. Since the main sensor has trouble running at more than 30-60Hz, CD AF has an automatic factor of 10-100 handicap compared to PD AF (i.e. 10 samples at 30Hz versus 1 sample at 300Hz).

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Lee Jay
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