• 35mm 861.6mm2
  • 24.6 megapixels
  • ISO 200 - 3200
  • Medium format 1,452.0mm2
  • 40.0 megapixels
  • ISO 200 - 1000
  • Detailed specifications
  • Sony Alpha DSLR-A900
  • Pentax 645D
Links
Prices:   Compare Prices
Manufacturer URL: Manufacturer website Manufacturer website
Predecessor:    
Successor:   Pentax 645Z
645D vs 645Z
General
Model Number: A900 645D
Alternate Model Number(s):    
Camera Format: Pro SLR Pro SLR
Currently Manufactured: No No
Retail Price: $2999.99 $9995.95
Street Price:   $3,599.00
Date Available: 2008-11-15 2010-12-15
Tripod Mount: Yes Yes
Weight: 33.1 oz (939 g)
includes batteries
52.2 oz (1,480 g)
includes batteries
Size: 6.2 x 4.6 x 3.2 in.
(156 x 117 x 82 mm)
6.1 x 4.6 x 4.7 in.
(156 x 117 x 119 mm)
Waterproof: No No
Waterproof Depth: n/a n/a
Image Sensor
Sensor Type: CMOS CCD
Sensor Manufacturer: Sony Kodak KAF-40000
Effective Megapixels: 24.6 40.0
Sensor Format: 35mm Medium format
Sensor size: 861.6mm2 (35.90mm x 24.00mm) 1452mm2 (44.00mm x 33.00mm)
Approximate Pixel Pitch: 5.94 microns 6.06 microns
Focal Length Multiplier: 1.0x 0.8x
Aspect Ratio: 3:2, 16:9 4:3
Color Filter Type: RGBG RGBG
Anti Aliasing Filter: Fixed None
Self-Cleaning: Yes Yes
Sensor shift image stabilization: Yes No
On-Sensor Phase Detect: No No
DxO Sensor Score: 79 82
DxO Color Depth Score (bits): 23.7 24.6
DxO Dynamic Range Score (evs): 12.3 12.6
DxO Maximum Effective ISO Score (iso): 1,431 1,262
Image Capture
Image Resolution: 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)
7264 x 5440 (39.5 MP, Other),
6528 x 4896 (32.0 MP, 4:3),
5376 x 4032 (21.7 MP, 4:3),
4224 x 3168 (13.4 MP, 4:3),
3072 x 2304 (7.1 MP, 4:3)
Image File Format: JPEG (EXIF 2.21), RAW, cRAW, RAW+JPEG; (ARW 2.0) JPEG, 14-bit PEF / DNG Raw
Continuous-mode frames/second: 5.0 1.1
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
HD Video Out: Yes Yes
HD Video Connection: HDMI HDMI
Lens & Optics
Lens Mount: Sony Alpha (Minolta A) Pentax 645 bayonet
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: 9-point TTL phase detection with 10 assist points, center dual-cross at f/2.8. 11-point SAFOX IX+ Phase Difference Detection, single / continuous
Auto Focus Assist Light? Yes No
Manual Focus: Yes Yes
Viewfinder
Viewfinder: Optical / LCD (playback only) Optical / LCD (playback only)
Viewfinder Type: SLR type; eye-level pentaprism with 100% coverage, 0.74x mag., 20mm eyepoint, -3 to +1 diopter Trapezoid prism finder w/ Natural-Bright-Matte focusing screen; Coverage: 98%; Magnification: 0.62X (with D FA645 55mm F2.8 lens at infinity)
Focus Peaking: No No
EVF Resolution: n/a n/a
Viewfinder Magnification (35mm equivalent): 0.74x 0.78x
Viewfinder Magnification (nominal/claimed): 0.74x 0.62x
Display
Eye-level Viewfinder: Yes Yes
Rear Display: Yes Yes
Rear Display Size (inches): 3.0 3.0
Rear Display Resolution: 921,600 dots 921,000 dots (307,000 px)
Touchscreen: No No
Articulating Screen: No No
Tilt Swivel Screen: No No
Selfie Screen: No No
Max Playback Zoom: 19.0x  
Top Deck Display: Yes Yes
Exposure
Maximum ISO (native): 3200 1000
Minimum ISO (native): 200 200
ISO Settings: Auto, 200-3200, Extensions to 100 and 6400 Auto (with programmable limits), 200 to 1000 in 1, 1/2 or 1/3 EV steps; expandable to 100 and 1600
Auto ISO Mode: Yes Yes
White Balance Settings: Auto, Daylight, Shade, Cloudy, Tungsten, Fluorescent, Flash, Color Temperature from 2,500K to 9,900K, Custom (3) Auto, Daylight, Shade, Cloudy, Fluorescent ( D / N / W / L), Tungsten, Flash, CTE, Manual 1 / 2 / 3, Color temperature setting 1 / 2 / 3 w/ adjustment
Shutter Speed Range: 1/8000 - 30 sec 1/4000 - 30 sec
Bulb Mode: Yes Yes
Exposure Compensation: +/- 3.0EV in 0.3EV steps +/- 5.0EV in 0.3EV steps
Metering Modes: 40-segment Honeycomb Pattern, Center-weighted, Spot 77-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:    
Self Timer: 2 or 10 seconds 2 or 12 seconds
Time Lapse (intervalometer):   Yes
High Resolution Composite: No No
Flash
Built-in Flash: No No
Flash Modes: n/a P-TTL, high-speed sync, wireless sync w/ Pentax flash
Flash Guide Number (ISO 100): n/a n/a
Flash Range Description: n/a n/a
Max Flash Sync: 1/250 1/125
Flash Exposure Compensation: +/- 3.0 EV in 0.3EV steps  
External Flash Connection: Hot shoe, PC-sync Hot shoe, X-sync socket
Built-In Wireless Flash Control:    
Image Storage
Usable Memory Types: CF1 / CF2 / MS Duo / MS PRO Duo / Microdrive SD / SDHC / SDXC
UHS Support:   No UHS support
Other Memory:    
Dual Card Slots: Yes Yes
RAW Capture Support: Yes Yes
Uncompressed Format: RAW, cRAW, RAW+JPEG; (ARW 2.0) 14-bit PEF / DNG Raw
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 No
DPOF Compliant: Yes No
Remote Control: Yes Yes
Remote Control Type: Wired or wireless Optional IR or wired
Connections (extended): DC input, Multi-connector, Sync termimal, Remote terminal, HDMI Type-C minijack DC input
Performance Timing
Cycle time for JPEG shooting in single shot mode (seconds per frame, max resolution): 0.40 1.09
Cycle time for RAW shooting in single shot mode (seconds per frame): 0.41 1.10
Buffer size for RAW shooting in single shot mode (frames): 15 17
Cycle time for RAW+JPEG shooting in single shot mode (seconds per shot):   1.09
Camera penalizes early shutter press? No Yes
JPEG shooting speed in burst mode (fps, max resolution): 5.0 1.1
Buffer size for JPEG shooting in burst mode (frames, max resolution): 11 19
RAW shooting speed in burst mode (fps):   1.1
Buffer size for RAW shooting in burst mode (frames):   16
RAW+JPEG shooting speed in burst mode (fps):   1.1
Buffer Size for RAW+JPEG shooting in burst mode (frames):   15
Shutter lag (full AF, wide/mid): 0.18 seconds 0.16 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 0.141 seconds
Shutter lag (full AF, with flash):    
Shutter Lag (prefocused): 0.072 seconds 0.142 seconds
Shutter Lag (notes):   Full Autofocus lag, Auto Area AF = 0.180s
Startup Time: 0.5 seconds 0.7 seconds
Play -> Record Time: 0.3 seconds 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 800 shots
Battery Life, Video:    
Battery Form Factor: Proprietary Proprietary D-LI90
Usable Battery Types: NP-FM500H Lithium-ion rechargeable Lithium-ion rechargeable
Batteries Included: 1 x Proprietary NP-FM500H Lithium-ion rechargeable 1 x Proprietary D-LI90 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: Image Data Converter SR, Image Data Lightbox SR, Remote Camera Control (all Windows & Macintosh), Picture Motion Browser (Windows only). PENTAX Digital Camera Utility 4 (Ver.4.20)
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. Compatible with PENTAX 645AF2, 645AF, and 645A mount lenses. Has dual SD/SDHC card slots.