• APS-C 369.7mm2
  • 14.6 megapixels
  • ISO 100 - 3200
  • 35mm 861.6mm2
  • 24.6 megapixels
  • ISO 200 - 3200
  • Detailed specifications
  • Samsung GX-20
  • Sony Alpha DSLR-A900
Links
Prices:    
Manufacturer URL: Manufacturer website Manufacturer website
Predecessor:    
Successor:    
General
Model Number: GX-20 A900
Alternate Model Number(s):    
Camera Format: Pro SLR Pro SLR
Currently Manufactured: No No
Retail Price: $1399.95 $2999.99
Street Price:    
Date Available: 2008-03-30 2008-11-15
Tripod Mount: Yes Yes
Weight: 25.2 oz (714 g) 33.1 oz (939 g)
includes batteries
Size: 5.6 x 4.0 x 2.8 in.
(142 x 102 x 70 mm) 		6.2 x 4.6 x 3.2 in.
(156 x 117 x 82 mm)
Waterproof: No No
Waterproof Depth: n/a n/a
Image Sensor
Sensor Type: CMOS CMOS
Sensor Manufacturer:   Sony
Effective Megapixels: 14.6 24.6
Sensor Format: APS-C 35mm
Sensor size: 369.72mm2 (23.7mm x 15.6mm) 861.6mm2 (35.90mm x 24.00mm)
Approximate Pixel Pitch: 5.07 microns 5.94 microns
Focal Length Multiplier: 1.5x 1.0x
Aspect Ratio: 3:2 3:2, 16:9
Color Filter Type: RGBG RGBG
Anti Aliasing Filter: Fixed Fixed
Self-Cleaning: Yes Yes
Sensor shift image stabilization: Yes Yes
On-Sensor Phase Detect: No No
DxO Sensor Score: 68 79
DxO Color Depth Score (bits): 23.1 23.7
DxO Dynamic Range Score (evs): 11.2 12.3
DxO Maximum Effective ISO Score (iso): 714 1,431
Image Capture
Image Resolution: 4672 x 3104 (14.5 MP, Other),
3872 x 2592 (10.0 MP, Other),
3008 x 2000 (6.0 MP, 3:2),
1824 x 1216 (2.2 MP, 3:2) 		6048 x 4032 (24.4 MP, 3:2),
6048 x 3408 (20.6 MP, Other),
4400 x 2936 (12.9 MP, 3:2),
4400 x 2472 (10.9 MP, 16:9),
3984 x 2656 (10.6 MP, 3:2),
3024 x 2016 (6.1 MP, 3:2),
2896 x 1928 (5.6 MP, 3:2),
3024 x 1704 (5.2 MP, Other),
1984 x 1320 (2.6 MP, 3:2)
Image File Format: JPEG (EXIF 2.21), RAW (.PEF, .DNG), 14-bit JPEG (EXIF 2.21), RAW, cRAW, RAW+JPEG; (ARW 2.0)
Continuous-mode frames/second: n/a 5.0
Video Capture
Can take movies: No No
Movie Resolution:
Movie File Format:    
Composite Video Out: Yes Yes
NTSC/PAL Switchable Video: Yes Yes
Video Usable as Viewfinder: No No
HD Video Out: No Yes
HD Video Connection: HDMI
Lens & Optics
Lens Mount: Pentax K (KA/KAF/KAF2) Sony Alpha (Minolta A)
Lens: n/a n/a
Focal Length (35mm equivalent):    
Focal Length (actual):    
Zoom Ratio:    
Aperture Range:    
Integrated ND Filter: No No
Normal Focus Range:    
Macro Focus Range:    
Filter Thread: n/a n/a
Thread Type: n/a n/a
Optical Image Stabilization: No No
Digital Zoom: No No
Digital Zoom Values: n/a n/a
Auto Focus
Auto Focus: Yes Yes
Auto Focus Type: 11-point TTL phase-matching (SAFOX VIII) 9-point TTL phase detection with 10 assist points, center dual-cross at f/2.8.
Auto Focus Assist Light? Yes Yes
Manual Focus: Yes Yes
Viewfinder
Viewfinder: Optical / LCD Optical / LCD (playback only)
Viewfinder Type: SLR type; eye-level pentaprism SLR type; eye-level pentaprism with 100% coverage, 0.74x mag., 20mm eyepoint, -3 to +1 diopter
Focus Peaking: No No
EVF Resolution: n/a n/a
Viewfinder Magnification (35mm equivalent):   0.74x
Viewfinder Magnification (nominal/claimed):   0.74x
Display
Eye-level Viewfinder: Yes Yes
Rear Display: Yes Yes
Rear Display Size (inches): 2.7 3.0
Rear Display Resolution: 230,000 dots 921,600 dots
Touchscreen: No No
Articulating Screen: No No
Tilt Swivel Screen: No No
Selfie Screen: No No
Max Playback Zoom: 32.0x 19.0x
Top Deck Display: Yes Yes
Exposure
Maximum ISO (native): 3200 3200
Minimum ISO (native): 100 200
ISO Settings: Auto, 100, 200, 400, 800, 1600, 3200, 6400 (expanded) Auto, 200-3200, Extensions to 100 and 6400
Auto ISO Mode: Yes Yes
White Balance Settings: Auto, Daylight, Shade, Cloudy, Tungsten, Fluorescent (W, D, N), Flash, Color Temperature Auto, Daylight, Shade, Cloudy, Tungsten, Fluorescent, Flash, Color Temperature from 2,500K to 9,900K, Custom (3)
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: TTL open-aperture: 16-segment, Center-weighted, Spot 40-segment Honeycomb Pattern, Center-weighted, Spot
Program Auto Exposure: Yes Yes
Aperture Priority: Yes Yes
Shutter Priority: Yes Yes
Full Manual Exposure: Yes Yes
Creative Exposure Modes: Sensitivity Priority, Shutter and Aperture Priority  
Self Timer: 2 or 12 seconds 2 or 10 seconds
Time Lapse (intervalometer):    
High Resolution Composite: No No
Flash
Built-in Flash: Yes No
Flash Modes: On, Redeye, Slow Sync, Slow Sync + Redeye, Trailing Curtain Sync, Wireless n/a
Flash Guide Number (ISO 100): n/a n/a
Flash Range Description: Depends on lens n/a
Max Flash Sync: 1/180 1/250
Flash Exposure Compensation:   +/- 3.0 EV in 0.3EV steps
External Flash Connection: Hot Shoe, X-Sync Socket Hot shoe, PC-sync
Built-In Wireless Flash Control:    
Image Storage
Usable Memory Types: SD / SDHC CF1 / CF2 / MS Duo / MS PRO Duo / Microdrive
UHS Support:    
Other Memory:    
Dual Card Slots: No Yes
RAW Capture Support: Yes Yes
Uncompressed Format: RAW (.PEF, .DNG), 14-bit RAW, cRAW, RAW+JPEG; (ARW 2.0)
Movie File Format:    
Included Memory: No memory included  
Included Memory Type:    
Connectivity
Built-In Wi-Fi: No No
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
PictBridge Compliant: Yes Yes
DPOF Compliant: Yes Yes
Remote Control: Yes Yes
Remote Control Type: Wired or IR Wired or wireless
Connections (extended): DC input, wired remote DC input, Multi-connector, Sync termimal, Remote terminal, HDMI Type-C minijack
Performance Timing
Cycle time for JPEG shooting in single shot mode (seconds per frame, max resolution):   0.40
Cycle time for RAW shooting in single shot mode (seconds per frame):   0.41
Buffer size for RAW shooting in single shot mode (frames):   15
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):   5.0
Buffer size for JPEG shooting in burst mode (frames, max resolution):   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):   0.18 seconds
Shutter lag (full AF, tele):    
Shutter lag (full AF, live view - DSLR):    
Shutter lag (prefocused, live view - DSLR):    
Shutter Lag (manual focus):   0.153 seconds
Shutter lag (full AF, with flash):    
Shutter Lag (prefocused):   0.072 seconds
Shutter Lag (notes):    
Startup Time:   0.5 seconds
Play -> Record Time:   0.3 seconds
Flash cycle time, full power:    
Power
Battery Life, Stills (CIPA Rating Monitor/Live View):    
Battery Life, Still (CIPA Rating OVF/EVF):   880 shots
Battery Life, Video:    
Battery Form Factor: Proprietary Proprietary
Usable Battery Types: Lithium-ion rechargeable NP-FM500H Lithium-ion rechargeable
Batteries Included: 1 x Proprietary Lithium-ion rechargeable 1 x Proprietary NP-FM500H Lithium-ion rechargeable
Battery Charger Included (dedicated charger or AC/USB adapter): Yes Yes
Dedicated Battery Charger Included:
Internal Charging Supported:
Software
Included Software:   Image Data Converter SR, Image Data Lightbox SR, Remote Camera Control (all Windows & Macintosh), Picture Motion Browser (Windows only).
OS Compatibility:   Windows 2000Pro/XP/Vista; Mac OS X (v 10.1.3+)
Miscellaneous
Notes & Features: 24.6MP Full-frame CMOS sensor, In-body SteadyShot Image Stabilization, Intelligent Preview, Enhanced DRO, Magnesium-alloy Body, Dust/Moisture Resistance, 100K Shutter, 3 User Programmable Memory Modes, AF Micro-adjustment, Top Mounted LCD, Quick Navigation system, Custom button, PhotoTV HD output via HDMI optimized for Sony Bravia TVs.