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Don Parrish August 25th, 2004 02:47 PM

20D tech question AF
Somebody "splain" to me about the AF points and what is different when one uses a 2.8 lens vs others??

Jeff Donald August 25th, 2004 03:01 PM

The center point switches to precision mode when lens faster than f/2.8 are attached. The precision mode is able to focus to 1/3 the DOF of a non-precision sensor.

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