I've been having trouble for some time with a focus problem. I shoot with a D7000 body and typically with a Sigma 50mm 1/4 lens. When I use the viewfinder and focus (manually or automatically) when it appears to be in focus and I snap the photo it always ends up out of focus and not what it appeared in the viewfinder. Therefore, I've resorted to using the "video mode" which opens up the screen to use as a viewfinder. Even so, it is very hard to focus both manually and automatically. I've sent the lens in for calibration, but it hasn't seemed to help. Does anyone have a service provider that they would recommend for me to visit to help me determine if the problem is in the body or the lens? I appreciate any advice or information! Thank you!