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The Sony Alpha a550 (DSLR-A550) is a midrange-level digital single-lens reflex camera (DSLR) marketed by Sony and aimed at enthusiasts, it was released in August 2009.〔(PhotoZone | Sony Alpha 550 Review )〕 The camera features a 14.2 megapixel APS-C Type CMOS Exmor Sensor and features Sony's patented SteadyShot INSIDE stabilisation system which works with any attached lens.〔(dp review | Sony Alpha 550 Review )〕 The Sony Alpha a550's main selling point is its dual Live View mode's, Sony's normal secondary; smaller sensor based Live View mode and another which uses the main sensor with no autofocus. The a550 also features a maximum of 7frame/s continuous shooting speed when operating in speed-priority mode and a maximum ISO of 1600 when in auto mode and 12800 ISO when in manual mode.〔(Sony.co.uk | Sony Alpha 550 )〕 The Sony Alpha a550 is "big brother" to the Sony Alpha a500, an almost identical DSLR with a smaller 12.3 megapixel APS-C CMOS sensor, no 7frame/s continuous shooting and a lower resolution LCD. == Live View == The a550 stands out from other DSLR's in its price range with its use of 2 separate Live View modes. The first mode operates in the same way other DSLR's do, by switching from using the main sensor to using a secondary, smaller sensor. This allows the a550 to autofocus in its first Live View mode. However this only provides a 90% view of the final image the main sensor will take. The second Live View mode is named Manual Focus Check Live View. This mode uses the main 14.2 megapixel APS-C Type CMOS Exmor Sensor to provide a 100% view on the rear LCD. This mode does not allow auto focusing, hence the name Manual Focus Check Live View.〔(CameraLabs | Sony Alpha 550 Review )〕〔(dp review | Sony Alpha 550 Review )〕 When in Live View mode the a550 uses its 3.0 TFT Xtra Fine LCD, with 921,600 dots which can be adjusted to point downwards, for overhead shooting or upwards for below eye level shooting. When Live View mode is not in use the optical viewfinder(OVF) is used and only provides 95% coverage of the actual image taken by the sensor. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sony Alpha 550」の詳細全文を読む スポンサード リンク
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