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

Started Dec 21, 2004 | Discussions thread
DG
DG
Forum MemberPosts: 69
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Re: F2.8 has DIFFERENT focusing on 20D...
In reply to svx94, Apr 17, 2005

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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