Thanks to a buddy who let me play around with the Canon 5D Mark II, I figured out a useful trick for precision focusing in HD video mode on the Nikon D300s. When in Live View mode (either handheld or tripod mode) you can use the + and – buttons on the left of the viewfinder to digitally zoom in on your subject. Then, use the AF button to focus (or manually do so) and zoom back out. Presuming you don’t move the camera and your subject stays still, you can now rest assured your footage will be in focus. This tip is particularly helpful when using a shallow depth of field on bright days or when you don’t have a viewfinder eyepiece.