Mid 2012 13" MBP Mountain Lion / Apple TV (3rd gen) / Vizio 37" 1080p Television When I use Airplay to mirror to Apple TV the image I get on the television shrinks. The image never fills the television screen. I measured and I only get a 35" image on the 37" screen. Everything down to the text shrinks. The image sits inside black on all four sides. I've tried every scenario I can think of with settings. Nothing is working. I found a few threads on the web and tried what they suggested and nothing has changed. Eveything from image auto setting on Apple TV to overscan on MBP. When I Airplay with my iPhone 4 everything is fine. Video fills the television. I can play a video with my MBP via Home Share through iTunes and it fits the television perfectly fine. Now when I watch the same video through just Quicktime and Airplay the video will not fill the television. I get the shrunk 35" image. On a side note I also get extreme lag and stutter playing a video via Airplay alone. However, the same video will play flawlessly via Home Share iTunes. Another example would be HBO GO via iPhone Airplay fits the television perfectly fine. When I stream HBO GO from MBP Airplay I get the shrunk 35" image. Any help at getting a true MBP screen mirrored to my televison via Apple TV? Am I doing something wrong? Did the sales person at Apple lie to me when I asked if I could mirror full res from my MBP? I'm not just concerned about video playback. I was hoping to use it for applications like FCP. Thanks!!!