Like all Olympus D-SLRs, this one has a Four Thirds format image sensor. It's smaller than the APS-C-sized sensors found in other brands, but this allows comparable lenses to be made lighter and more compact. The smaller chip also gives the E-510 a higher FOV crop factor, 2X instead of the usual 1.5X or 1.6X. Unlike Olympus's E-330, which has a two-mode live view system that allows autofocus with the mirror down, the E-510 has just one live-view mode. Simply hit a button to raise its mirror and your subject appears on the LCD. This disables AF but lets you see real-time exposure and white balance changes, as well as a live histogram. The system is great for composing high- and low-angle shots, as well as for macro and studio work. Shooting with the small but serviceable optical viewfinder is still quicker. Though there are only three focus points, AF is super-swift, particularly in continuous mode. Aimed at serious users, the E-510 has lots of advanced features, our favorite being its LCD "super control panel." It's a brilliant alternative to hunting through a menu, offering one-finger access to 17 key settings with the four-way control pad.