CD 'optimized' lenses

Started Jun 11, 2012 | Discussions thread
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Ivanaker New Member • Posts: 17
CD 'optimized' lenses

I read a lot about 'contrast detect AF optimized lenses'. What does it mean for lens? Camera tells the lens where to focus, so its important for camera if it is CD or PD, and lens does only what camera tells the lens to do. What am i missing?

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