20D+580ex+ Sigma 18-50 f2.8 users

Started Dec 21, 2004 | Discussions thread
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DG OP Forum Member • Posts: 69
Re: F2.8 has DIFFERENT focusing on 20D...

Yup, the center AF point is a high precision sensor (3x more precise focussing), which is active when used with F2.8 or faster lenses.

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