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I think that this image has wrong filed lines...
http://upload.wikimedia.org/wikipedia/commons/e/ef/AGFocus1.gif
- Looks OK to me. What do you think is the problem?- (User) WolfKeeper (Talk) 01:07, 18 July 2008 (UTC)
Weak focusing
editIn the introduction, I think the part about weak focusing, it should read: [...] the principle that nearby circles [...] only intersect TWICE per revolution. OR: [...] only ONCE per half-revolution.