stsva wrote in post #13823783
I think KenjiS is talking about the size of the actual focus sensors, not the AF points in the viewfinder. The actual AF sensors cover a substantially larger area of the scene than the AF boxes in the viewfinder, which can throw focus somewhere other than intended without the photographer realizing it. This can result in the belief that the camera is missing focus (especially when shooting with a very limited DOF) when in fact the AF system is working as designed.
Precisely, I just wish the design was better (I fully realize its working "the way its designed" i just hate that the way its designed means it chooses to focus on the edge of the leaf at the VERY bleeding edge of the AF point, using spot AF, as opposed to the bird i really want on focus, Or grabbing the VERY EDGE of my dog's ear instead of her eye, Whatever is MOSTLY in the focus point should be what the camera focuses on, and things near the very edge should not affect that the way in my experience it does..)
For instance the Nikon D300s and its 51-points cover roughly the same area (ok slightly more) as the 7D's 19, but the points themselves are much smaller.... I would rather have the D300s' array compared to the 7D's as i feel personally that its more selective...
The points themselves on the 7D are bloody -huge- imho, and while useful when tracking moving subjects are less discerning when working with precise applications...