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Old August 25th, 2004, 02:47 PM   #1
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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??
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Old August 25th, 2004, 03:01 PM   #2
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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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