I have both the XTi and 50mm and shoot primarily in Av mode, but if focusing is an issue when there is movement then you need to set your AF to AI Focus or Al Servo rather than One Shot. Either that or set it to the Sports mode. That should take care of your focusing problem, assuming that the problem pertains to your subject being out of focus when you take the picture. If the problem has to do with depth of field (DOF), then do like what was suggested above...shoot at f/8 or smaller aperture (f/8 to f/16).Originally Posted by desmo13
Personally, I love shallow depth of field except for landscape shots, which means I generally like to shoot the 50mm wide open at f/1.8 and on up to f/2.8 (see my photos above) when taking pictures of people or objects.



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