Sony's FDAEV1S Electronic Viewfinder ($349.99 direct) is compatible only with the company's Alpha NEX-5N ($699.99, 4.5 stars) digital camera. The compact viewfinder plugs into the camera's accessory port, adding eye-level framing capability. Intended for shooters who prefer a viewfinder to the camera rather than the using the rear LCD for framing photos, the viewfinder can also tilt 90 degrees, which is helpful when using the camera on a tripod set low to the ground.

Eschewing traditional LCD technology, the OLED display packs two million dots into a small form factor, presenting a crisp image that is equally bright from corner to corner. I haven't had the opportunity to extensively test the viewfinder, but I did have a brief hands-on with it at a press event. It's the best EVF I've used, and I preferred it to a D-SLR with a pentamirror viewfinder in a side-by-side comparison. It may not be up to the standards of high-quality pentaprism finders found in nicer D-SLRs, but if you're a NEX-5N owner and prefer eye-level shooting, there is no better option.

The EVF's field of view is 100%, so you'll see everything that your camera's lens does. A built-in diopter can be adjusted from -4 to +1, allowing you to adjust it to best match your vision. It measures 1.4 by 1.1 by 1.6 inches (HWD) and weighs 1 ounce. The EVF plugs into the accessory port of the NEX-5N, so you won't be able to use a flash or microphone at the same time. Unfortunately, it is not compatible with older NEX models, like our Editors' Choice NEX-C3 ($649.99, 4.5 stars).