Saturday, February 2, 2013

Why the point which I didn't focus on is sharper than the one I focused on?

I have Nikon D7000, when I focus on an object (using AF-S, Single point AF, Matrix Metering, 35mm),
I noticed after I review the picture that the point which is not in focus is sharper than the point (eye) that I focus intentionally.
I took a picture to a girl and I position focus point on her right eye but the result is the left eye is sharper! (I didn't use the point in the center of view finder)
>>> Why the point which I didn't focus on is sharper than the one I focused on?