Press it at any time and the mirror flips up and the camera immediately enters ... SLRs from Nikon's arch-rival Canon. In a new wrinkle, the Nikon D90 has only one autofocus mode in Live View ...

As with most DSLRs, the Nikon D90 has an optical viewfinder that lets you view your subject through the lens. Following a popular trend though, it also offers a Live View mode, in which the mirror ...