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The Sony Alpha 57 (model name SLT-A57) is a Digital single-lens reflex camera that replaced the A55 in 2012. The camera features an electronic viewfinder and a translucent mirror. The main advantage of a translucent mirror is that it needn't flip up out of the way when taking a picture in order to expose the sensor, but the camera can focus and capture images simultaneously. The camera's 15-point autofocus system can be set to single, continuous or automatic and is arranged towards the centre. The 12-fps burst mode is available only in "speed priority" mode but can reach up to 5.5 fps burst rate in combination with any other settings.
Feature list
- 16.1-megapixel Exmor™ CMOS sensor (4912 × 3264) [1]
- Updated BIONZ™ image processor
- ISO 100 - 16,000 (25,600 with multi-image combination)
- Auto ISO 100 - 3200
- Pull-out three-hinge tilt/swivel 921K dot TruBlack™ LCD screen
- Stereo microphone and external mic socket
- Dust shake sensor cleaning
- second-generation Translucent Mirror Technology™
- 12 fps burst mode at full 8-megapixel resolution
- Tru-Finder™ XGA electronic viewfinder with 1440K dots resolution with full 100% frame coverage.
- AVCHD video recording at 1920 × 1080 (50p/60p (1080p) @ 28 Mbit/s, 50i/60i (1080i) @ 24 Mbit/s, 50i/60i (1080i) @ 17 Mbit/s, 25p/24p (1080p) @ 24 Mbit/s, 25p/24p (1080p) @ 17 Mbit/s, 25p/24p (1080p)) @ 12 Mbit/s)[2]
- MPEG-4 video recording at 1440 × 1080 (approx. 25/30 fps @ 12 Mbit/s (average bit-rate),[3] 640 x 480 (approx 25/30fps @ 3Mbit/s)
- Live View with full-time Phase Detection AF
- 15-point autofocus sensors.
- SteadyShot™ image stabilization system in body
- 3D Sweep Panorama™
- Full tilt/swivel LCD screen
- Multi-frame noise reduction
- Object tracking AF
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