• APS-C 369.7mm2
  • 16.1 megapixels
  • ISO 100 - 16,000
  • APS-C 369.7mm2
  • 20.3 megapixels
  • ISO 100 - 12,800
  • Detailed specifications
  • Sony Alpha SLT-A57
  • Samsung NX20
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Manufacturer URL: Manufacturer website Manufacturer website
Predecessor:    
Successor:    
General
Model Number: A57 NX20
Alternate Model Number(s):    
Camera Format: SLR Compact System Camera
Currently Manufactured: No No
Retail Price: $799.99 $1099.99
Street Price:   $499.00
Date Available: 2012-04-15 2012-05-05
Tripod Mount: Yes Yes
Weight: 29.2 oz (828 g)
includes batteries, kit lens
22.5 oz (637 g)
includes batteries, kit lens
Size: 5.2 x 3.8 x 3.2 in.
(132 x 98 x 81 mm)
4.8 x 3.5 x 1.6 in.
(122 x 90 x 40 mm)
Waterproof: No No
Waterproof Depth: n/a n/a
Image Sensor
Sensor Type: CMOS CMOS
Sensor Manufacturer: Sony Samsung
Effective Megapixels: 16.1 20.3
Sensor Format: APS-C APS-C
Sensor size: 369.72mm2 (23.7mm x 15.6mm) 369.72mm2 (23.7mm x 15.6mm)
Approximate Pixel Pitch: 4.82 microns 4.33 microns
Focal Length Multiplier: 1.5x 1.5x
Aspect Ratio: 3:2 3:2
Color Filter Type: RGBG RGBG
Anti Aliasing Filter: Fixed Fixed
Self-Cleaning: Yes Yes
Sensor shift image stabilization: Yes No
On-Sensor Phase Detect: No No
DxO Sensor Score: 75 75
DxO Color Depth Score (bits): 23.4 23.4
DxO Dynamic Range Score (evs): 13.0 12.9
DxO Maximum Effective ISO Score (iso): 785 785
Image Capture
Image Resolution: 4912 x 3264 (16.0 MP, 3:2),
4912 x 2760 (13.6 MP, 16:9),
3568 x 2368 (8.4 MP, Other),
3568 x 2000 (7.1 MP, 16:9),
2448 x 1624 (4.0 MP, Other),
2448 x 1376 (3.4 MP, 16:9),
12416 x 1856 (23.0 MP, Other),
5536 x 2160 (12.0 MP, Other),
8192 x 1856 (15.2 MP, Other),
3872 x 2160 (8.4 MP, Other),
7152 x 1080 (7.7 MP, Other),
4912 x 1080 (5.3 MP, Other),
1920 x 1080 (2.1 MP, 16:9)
5472 x 3648 (20.0 MP, 3:2),
5472 x 3080 (16.9 MP, 16:9),
3648 x 3648 (13.3 MP, 1:1),
3888 x 2592 (10.1 MP, 3:2),
3712 x 2088 (7.8 MP, 16:9),
2640 x 2640 (7.0 MP, 1:1),
2976 x 1984 (5.9 MP, 3:2),
2736 x 1824 (5.0 MP, 3:2),
2944 x 1656 (4.9 MP, 16:9),
2000 x 2000 (4.0 MP, 1:1),
1920 x 1080 (2.1 MP, 16:9),
1728 x 1152 (2.0 MP, 3:2),
1024 x 1024 (1.0 MP, 1:1)
Image File Format: JPEG, MPO, RAW (12-bit ARW 2.3), RAW+JPEG JPEG (EXIF 2.21), .SRW 12-bit RAW
Continuous-mode frames/second: 10.0 7.5
Video Capture
Can take movies: Yes Yes
Movie Resolution: 1920x1080 (60p(PS)/​60i(FX)/​60i(FH)/​24p(FX)/​24p(FH))
1440x1080 (30p)
640x480 (30p)
1920x1080 (30p)
1920x810 (24p)
1280x720 (30p)
640x480 (30p)
320x240 (30p)
Movie File Format: AVCHD 2.0/MP4 (Audio: Dolby Digital (AC-3)/MPEG-4 AAC-LC) MP4 (H.264) with AAC audio
Composite Video Out: No Yes
NTSC/PAL Switchable Video: n/a Yes
Video Usable as Viewfinder: n/a
HD Video Out: Yes Yes
HD Video Connection: HDMI HDMI
Lens & Optics
Lens Mount: Sony Alpha (Minolta A) Samsung NX
Lens: Sony 18-55mm f/3.5-5.6 DT SAM Samsung 18-55mm f/3.5-5.6 OIS NX
Focal Length (35mm equivalent): 27 - 83mm 27 - 84mm
Focal Length (actual): 18 - 55mm 18 - 55mm
Zoom Ratio: 3.06x 3.06x
Aperture Range: f/3.5 - 22 (W), f/5.6 - 36 (T) f/3.5 (wide) / f/5.6 (tele) - f/22
Integrated ND Filter: No No
Normal Focus Range: 25 cm to Infinity
9.8 in to Infinity
28 cm to Infinity
11.0 in to Infinity
Macro Focus Range:    
Filter Thread: 55.0mm 58.0mm
Thread Type: n/a n/a
Optical Image Stabilization: No Yes
Digital Zoom: Yes Yes
Digital Zoom Values: Up to 2x Precision, Up to 2x Clear Image Zoom, 1.4x (8.4MP) or 2.0x (4MP) Smart Zoom Up to 2x i-Zoom
Auto Focus
Auto Focus: Yes Yes
Auto Focus Type: Phase Detection: 15 points (3 points cross type); Wide (auto, 15 points), Zone, Spot, Local; Enhanced Object Tracking 15-point Contrast Detection; has single-point and 35-point closeup modes; Face Detection : Max. 10 faces
Auto Focus Assist Light? Yes Yes
Manual Focus: Yes Yes
Viewfinder
Viewfinder: EVF / LCD EVF / OLED
Viewfinder Type: EVF type; 1.1cm (0.43") 1.44M/1.25M-dot LCD (480K/418K-dot time-multiplexed RGB), 100% coverage, 1.04x/0.97x magnification, 23.1/25.2mm eyepoint, -4 to +3 diopter EVF type with Eye Contact Sensor; SVGA (800 x 600) TFT-LCD; Coverage: Approx. 100%; Magnification: Approx. 1.04X (APS-C, 50mm, -1m-1), Approx. 0.68X (Equivalent to a 50mm lens on a 35mm camera); Eyepoint: Approx. 18.0mm; Diopter Adjustment: -4.0 to +4.0m-
Focus Peaking: Yes No
EVF Resolution:   1,440,000 dots (480,000 pixels)
Viewfinder Magnification (35mm equivalent): 0.69x 0.69x
Viewfinder Magnification (nominal/claimed): 1.04x 1.04x
Display
Eye-level Viewfinder: Yes Yes
Rear Display: Yes Yes
Rear Display Size (inches): 3.0 3.0
Rear Display Resolution: 921,600 dots (307,200 px) 614,400 dots
Touchscreen: No No
Articulating Screen: Yes Yes
Tilt Swivel Screen:
Selfie Screen:
Max Playback Zoom: 13.6x  
Top Deck Display: No No
Exposure
Maximum ISO (native): 16000 12800
Minimum ISO (native): 100 100
ISO Settings: Auto (100-3200), 100 - 16000; (Multi-frame NR mode up to ISO 25600) Auto (100-3200), 100, 200, 400, 800, 1600, 3200, 6400, 12800 (1 or 1/3 EV steps)
Auto ISO Mode: Yes Yes
White Balance Settings: Auto, Daylight, Shade, Cloudy, Incandescent, Fluorescent (4), Flash, Custom, Color Temp./ Filter (2500-9900K with 15-step Magenta/Green compensation) Auto, Daylight, Cloudy, White Fluorescent, Neutral Fluorescent, Daylight Fluorescent, Tungsten, Flash, Custom, Kelvin Color Temp., 7-step A/B + G/M adjust
Shutter Speed Range: 1/4000 - 30 sec 1/8000 - 30 sec
Bulb Mode: Yes Yes
Exposure Compensation: +/- 3.0EV in 0.3EV steps +/- 3.0EV in 0.3EV steps
Metering Modes: 1200-zone Evaluative, Center-weighted, Spot 221-segment Multi, Center-weighted, Spot
Program Auto Exposure: Yes Yes
Aperture Priority: Yes Yes
Shutter Priority: Yes Yes
Full Manual Exposure: Yes Yes
Creative Exposure Modes: Portrait, SportsAction, Macro, Landscape, Sunset, Night scene, Hand-held Twilight (6 shot layering), Night Portrait; Sweep Panorama, 3D Sweep Panorama, Auto Portrait Framing, Picture Effect (Posterization (Color, B/W), Pop Color, Retro Photo, Partial Color (R,G,B,Y), High Contrast Monochrome, Toy Camera, Soft High-key, Soft Focus, HDR Painting, Rich-tone Monochrome, Miniature), Dynamic Range Optimizer (Off/Auto/Level), Scene: Panorama (Live, 3D), Beauty shot, Night, Landscape, Portrait, Children, Sports, Close-Up, Text, Sunset, Dawn, Backlight, Fireworks, Beach & Snow, Sound Picture, 3D Photo; Smart Filter: Vignetting, Miniature, Fish-Eye, Sketch, De-fog, Halftone Dots, Soft Focus, Old Film1, Old Film2, Negative, Selective Color (4 Color Modes); Magic Frame: Old Album, Old Film, Wave, Full Moon, Old Record, Magazine, Sunny Day, Classic TV, Wall Art, Holiday, Billboard 1, Billboard 2, Newspaper
Self Timer: 2 or 10 seconds 2-30 sec in 1 sec steps seconds
Time Lapse (intervalometer):    
High Resolution Composite: No No
Flash
Built-in Flash: Yes Yes
Flash Modes: Auto, Off, Fill-flash, Rear sync, Wireless, High-Speed sync, Slow sync, Red-eye reduction: On/Off Smart Flash, Auto, Auto+Red-eye reduction, Fill-in, Fill-in+Red-eye reduction, 1st Curtain, 2nd Curtain, Off
Flash Guide Number (ISO 100): 10.0 m / 32.8 ft. 11.0 m / 36.1 ft.
Flash Range Description: Lens dependent Depends on lens aperture
Max Flash Sync: 1/160 1/180
Flash Exposure Compensation: +/- 2.0 EV in 0.3EV steps +/- 2.0 EV in 0.5EV steps
External Flash Connection: Hot shoe Hot shoe
Built-In Wireless Flash Control:   No
Image Storage
Usable Memory Types: MS PRO Duo / SD / SDHC / SDXC SD / SDHC / SDXC
UHS Support:    
Other Memory:    
Dual Card Slots: No No
RAW Capture Support: Yes Yes
Uncompressed Format: RAW (12-bit ARW 2.3), RAW+JPEG .SRW 12-bit RAW
Movie File Format: AVCHD 2.0/MP4 (Audio: Dolby Digital (AC-3)/MPEG-4 AAC-LC) MP4 (H.264) with AAC audio
Included Memory:   No memory included
Included Memory Type:    
Connectivity
Built-In Wi-Fi: No Yes
NFC: No
Bluetooth: No No
Built-In GPS: No No
Microphone Jack: No No
Headphone Jack: No No
External Connections: USB 2.0 High Speed USB 2.0 High Speed,WiFi
PictBridge Compliant: Yes Yes
DPOF Compliant: Yes Yes
Remote Control: Yes Yes
Remote Control Type: Optional Wireless or Wired Optional wired (SR2NX02)
Connections (extended): Type-C Mini HDMI (BRAVIA Sync, PhotoTV HD); Wired Remote Terminal, 3.5mm External Stereo Micophone Jack, DC Input Micro (Type D) HDMI, Combined AV/USB/Remote Micro USB Port
Performance Timing
Cycle time for JPEG shooting in single shot mode (seconds per frame, max resolution):   1.40
Cycle time for RAW shooting in single shot mode (seconds per frame):   1.32
Buffer size for RAW shooting in single shot mode (frames):   4
Cycle time for RAW+JPEG shooting in single shot mode (seconds per shot):    
Camera penalizes early shutter press? No
JPEG shooting speed in burst mode (fps, max resolution): 10.0 7.5
Buffer size for JPEG shooting in burst mode (frames, max resolution): 25 11
RAW shooting speed in burst mode (fps):    
Buffer size for RAW shooting in burst mode (frames):    
RAW+JPEG shooting speed in burst mode (fps):    
Buffer Size for RAW+JPEG shooting in burst mode (frames):    
Shutter lag (full AF, wide/mid):   0.35 seconds
Shutter lag (full AF, tele):    
Shutter lag (full AF, live view - DSLR):    
Shutter lag (prefocused, live view - DSLR):    
Shutter Lag (manual focus):   0.060 seconds
Shutter lag (full AF, with flash):   0.62 seconds
Shutter Lag (prefocused):   0.044 seconds
Shutter Lag (notes):   Full AF Shutter Lag, Wide Area mode = 0.650s
Startup Time:   3.0 seconds
Play -> Record Time:   0.9 seconds
Flash cycle time, full power:   3.6 seconds
Power
Battery Life, Stills (CIPA Rating Monitor/Live View):   360 shots
Battery Life, Still (CIPA Rating OVF/EVF): 550 shots  
Battery Life, Video:    
Battery Form Factor: Proprietary Proprietary BP1310
Usable Battery Types: NP-FM500H Lithium-ion rechargeable Lithium-ion rechargeable
Batteries Included: 1 x Proprietary NP-FM500H Lithium-ion rechargeable 1 x Proprietary BP1310 lithium-ion rechargeable
Battery Charger Included (dedicated charger or AC/USB adapter): Yes Yes
Dedicated Battery Charger Included: Yes
Internal Charging Supported: No
Software
Included Software: Sony Software CD-ROM intelli-studio 3.0, Samsung RAW Converter 4, PC Auto Backup, Adobe Reader
OS Compatibility: Windows XP SP3/Vista SP2/7, Mac OS X (v.10.3 +) Windows, Mac OS (except intelli-studio)
Miscellaneous
Notes & Features: SteadyShot INSIDE Sensor-shift Image Stabilization (up to 4.5 EV correction), Full HD 1080p60 Video, Up to 12 fps Burst Mode (Tele-zoom Continuous Advance Priority AE), Enhanced Object Tracking AF, 2x Clear Image Digital Zoom, New Auto Portrait Framing, Tilting 921K-dot LCD, 1.44M-dot EVF. Built-in Wi-Fi (IEEE 802.11b/g/n support, Mobile Link, Remote Viewfinder, Social Sharing, Email, Cloud , Auto Backup, TV Link, Wi-Fi Direct), supports geotagging w/ optional WGS84 GPS Module.