![]() At least the button to the screen's right illuminates it effectively. It's small (only about an inch measured diagonally), with a minimal amount of information displayed. While the main LCD panel is a thing of beauty and a joy forever, the monochrome LCD on the top right seems like a begrudging afterthought. One handy feature not found in competitive models is the way the A900 automatically senses when the camera is turned vertically (with either side on top) and swaps the screen display orientation to match. The enlarged display cuts down on the level of detail, but makes it more readable at a glance. The Detailed Display provides an overview of most camera settings. The rear screen menu display can be set to one of three modes by pressing the DISP button during shooting. Sony was clever enough to display a grayscale chart on the brightness adjustment screen, which makes switching settings a lot more meaningful. LCD brightness can be adjusted in 11 steps. It's a handsome display when viewed straight on, though it does begin to gray out noticeably when held away at a moderate angle - not unusable, but not as wide-angle as the Canon 5D Mark II or Nikon D700. The standard for fine viewing in an upscale digital SLR today is a 3-inch LCD with 921,000-dot resolution, which is precisely what Sony delivers here. The A900 supports interchangeable focusing screens, including Type M screens that support very fast lenses and Type L screens that are equipped with a grid pattern.īeneath the viewfinder are sensors that automatically turn off the LCD monitor when you hold the camera up to your eye. The control for this is on the left of the viewfinder. There's a built-in viewfinder shutter, to prevent light leaking in when shooting on a tripod, a huge convenience compared to mounting a cover manually over the eyepiece. ![]() The diopter control (-3.0 to +1.0 m-1) is located on the right of the viewfinder. The viewfinder offers nearly 100% coverage, a true standout feature, with excellent brightness and easy legibility for the data readout. With the A900 and other full-frame SLRs, you get the full side-to-side, top-to-bottom coverage the lens is capable of delivering. That means more telephoto zoom out of the same lens, but also crops out the wide-angle areas. For the 24-105mm mm lens we used to test the A900, it would shoot like a 38-168mm lens. ![]() As seen below, the APS-C camera sensor used in most digital SLRs effectively multiplies the apparent lens size by a factor of 1.6. With a smaller sensor, only the middle portion of the light coming through the lens is captured - basically the center becomes the entire photo. The A900 sensor matches the 36 x 24mm dimensions of a frame of 35mm film, which avoids the apparent magnification that takes place when you mount a lens on a typical digital camera, with its smaller image sensor. The A900 incorporates an automatic dust reduction system that shakes the sensor itself (already motorized to provide in-camera image stabilization) every time you turn off the camera. That puts it ahead of its primary full-frame competitors in The Great Megapixel Race, with the Canon 5D Mark II at 21.1 megapixels and a paltry 12.1 megapixels for the Nikon D700. The full-frame CMOS image sensor measures 35.9 x 24.0 mm, with 25,720,000 gross pixels and 24,610,0000-pixel effective resolution. For test purposes we shot primarily with the TK, which produced the following levels of magnification at the minimum, maximum and middle zoom settings. The A900 is not sold in a kit configuration. ![]()
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