AF inner workings

[FJC]

Does anyone have a link to a good article that describes exactly how autofocus works? I know how to use it, but I'm just in the dark as to exactly how the camera/lens knows when something is in focus...

Thanks!

[Roger_Cavanagh]

If you check the Canon Sites section on this page (http://www.rogercavanagh.com/links/links-02_photo_sites.htm), there's a link to the Canon Camera Museum, which has a bunch of technical articles explaining stuff.

Regards,

[FJC]

Excellent, thank you!