I need a little input here; hopefully you can tell me if what I've discovered about my camera's AF is unusual or if it's normal.


Obviously AF is quicker than focusing manually. But is that its only advantage? Generally speaking should AF be able to resolve as much detail as MF?


In low light I'm better than my camera nearly every time. But even at 1/800 5.6 I'm getting more resolution by focusing manually.


Should I be disturbed by this?


The body is a 40D and the lenses I've used are the 70-200 2.8 IS and the 50 1.4.


Thanks for any thoughts you'd care to share.