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.

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Sony α 57

Overview
Type	Digital single-lens translucent camera
Lens
Lens	interchangeable, Sony A-mount
Sensor/medium
Sensor	23.5 mm × 15.6 mm, 16.1 effective megapixels CMOS
Film speed	Auto: 100-3200; Selectable: 100-16000; Multi Frame NR (up to ISO 25600)
Storage media	Memory Stick PRO Duo™, Memory Stick PRO-HG Duo™, SD memory card, SDHC memory card, SDXC memory card
Exposure/metering
Exposure metering	Advanced 1200-zone evaluative metering
Metering modes	Multi-segment, Center-weighted, Spot
Flash
Flash	Built-in flash, Range: approx. 3' - 15' (1 m - 5 m); Auto, Fill-flash, Slow Sync., Rear Sync., Hi-speed sync., Red-eye reduction (on/off selectable for Autoflash and fill-flash mode), Wireless;
Shutter
Shutter	electronically controlled, vertical-traverse, focal-plane Shutter
Shutter speed range	30–1/4000 sec, with Bulb, 1/160 sec X-sync
Continuous shooting	up to 12 Frames Per Second
Viewfinder
Viewfinder	0.46" SVGA Xtra Fine EVF (2174 dpi) (Electronic viewfinder) (1,440,000 pixels), Diopter Adjustment: -4.0 to +3.0 m-1, Field of View: 100%, 1.04x magnification
Image processing
White balance	Auto WB, Daylight, Shade, Cloudy, Incandescent, Fluorescent (Warm white/Cool white/Day white/Daylight), Flash, C. Temp 2500 to 9900 K, C Filter G7 to M7, 15-step, Custom, AWB micro adjustment
General
LCD screen	921k pixel 3-inch TFT LCD
Battery	InfoLITHIUM® NP-FM500H (7.2 V)
Weight	Approx. 618 g (with battery & media);
Made in	Thailand

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• 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