| Links | ||
|---|---|---|
| Prices: | Compare Prices | |
| Manufacturer URL: | Manufacturer website | Manufacturer website |
| Predecessor: |
Pentax 645D
645D vs 645Z |
|
| Successor: | ||
| General | ||
| Model Number: | A900 | 645Z |
| Alternate Model Number(s): | ||
| Camera Format: | Pro SLR | Pro SLR |
| Currently Manufactured: | No | Yes |
| Retail Price: | $2999.99 | $8499.95 |
| Street Price: | $4,845.43 | |
| Date Available: | 2008-11-15 | 2014-06-15 |
| Tripod Mount: | Yes | Yes |
| Weight: |
33.1 oz
(939 g)
includes batteries |
54.9 oz
(1,555 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
4.8 in. (156 x 117 x 123 mm) |
| Waterproof: | No | No |
| Waterproof Depth: | n/a | n/a |
| Image Sensor | ||
| Sensor Type: | CMOS | CMOS |
| Sensor Manufacturer: | Sony | Sony |
| Effective Megapixels: | 24.6 | 51.4 |
| Sensor Format: | 35mm | Medium format |
| Sensor size: | 861.6mm2 (35.90mm x 24.00mm) | 1436.64mm2 (43.80mm x 32.80mm) |
| Approximate Pixel Pitch: | 5.94 microns | 5.31 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 | 101 |
| DxO Color Depth Score (bits): | 23.7 | 26.0 |
| DxO Dynamic Range Score (evs): | 12.3 | 14.7 |
| DxO Maximum Effective ISO Score (iso): | 1,431 | 4,505 |
| 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) |
8256 x 6192
(51.1 MP,
4:3), 6192 x 5184 (32.1 MP, Other), 5376 x 4032 (21.7 MP, 4:3), 1920 x 1440 (2.8 MP, 4:3) |
| Image File Format: | JPEG (EXIF 2.21), RAW, cRAW, RAW+JPEG; (ARW 2.0) | JPEG, 14-bit PEF / DNG RAW, TIFF |
| Continuous-mode frames/second: | 5.0 | 3.1 |
| Video Capture | ||
| Can take movies: | No | Yes |
| Movie Resolution: |
1920x1080 (60i/50i/30p/25p/24p)
1280x720 (60p/50p/30p/25p/24p) |
|
| Movie File Format: | MOV (MPEG-4 AVC/H.264) with stereo sound; Motion JPEG (AVI) for Interval Movie Record | |
| Composite Video Out: | Yes | No |
| NTSC/PAL Switchable Video: | Yes | n/a |
| Video Usable as Viewfinder: | No | n/a |
| 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 | |
| Digital Zoom Values: | 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. | 27-point SAFOX 11+ Phase Difference Detection (25 cross type focus points in the center): Spot, Select, Expanded Area AF (S, M, L), Zone Select, Auto (27 AF Points) |
| Auto Focus Assist Light? | Yes | No |
| Manual Focus: | Yes | Yes |
| Viewfinder | ||
| Viewfinder: | Optical / LCD (playback only) | Optical / LCD |
| Viewfinder Type: | SLR type; eye-level pentaprism with 100% coverage, 0.74x mag., 20mm eyepoint, -3 to +1 diopter | Trapezoid prism finder w/ interchangeable Natural-Bright-Matte focusing screen; Coverage: ~98%; Magnification: ~0.62x (55mmF2.8 at infinity), ~0.85x (75mmF2.8 at infinity); Diopter: -3.5 m to + 2.0 m-1; Eye Relief: ~21 mm (from view window), ~24.1 mm (from center of lens) |
| Focus Peaking: | No | Yes |
| 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 | 3.2 |
| Rear Display Resolution: | 921,600 dots | 1,036,800 dots (345,600 px) |
| Touchscreen: | No | No |
| Articulating Screen: | No | Yes |
| Tilt Swivel Screen: | No | No |
| Selfie Screen: | No | No |
| Max Playback Zoom: | 19.0x | 16.0x |
| Top Deck Display: | Yes | Yes |
| Exposure | ||
| Maximum ISO (native): | 3200 | 204800 |
| Minimum ISO (native): | 200 | 100 |
| ISO Settings: | Auto, 200-3200, Extensions to 100 and 6400 | Auto, 100-204800 in 1, 1/2 or 1/3EV steps |
| 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, Multi Auto, Daylight, Shade, Cloudy, Fluorescent Light (D: Daylight Color, N: Daylight White, W: Cool White, L: Warm White), Tungsten, Flash, CTE; Manual mode(s): Manual (up to 3 settings can be saved), Color Temperature (up to 3 settings can be saved), Copying the white balance settings of a captured image possible |
| 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 | 86K-pixel RBG sensor: Multi-segment metering, Center-weighted metering, Spot metering |
| Program Auto Exposure: | Yes | Yes |
| Aperture Priority: | Yes | Yes |
| Shutter Priority: | Yes | Yes |
| Full Manual Exposure: | Yes | Yes |
| Creative Exposure Modes: | Sensitivity Priority, Shutter & Aperture Priority; HDR Capture: Auto, Type1, Type2, Type3, Exposure Bracket Value adjustable, Auto Align (automatic composition correction function) available; Custom Image: Bright, Natural, Portrait, Landscape, Vibrant, Radiant, Muted, Bleach Bypass, Reversal Film, Monochrome, Cross Processing (Random, Preset 1-3, Favorite 1-3) | |
| 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 supported with compatible flash unit |
| 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 | -2 to +1 EV |
| 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: | UHS-I | |
| 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, TIFF |
| Movie File Format: | MOV (MPEG-4 AVC/H.264) with stereo sound; Motion JPEG (AVI) for Interval Movie Record | |
| 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 | Yes |
| Headphone Jack: | No | No |
| External Connections: | USB 2.0 High Speed | USB 3.0 Super Speed |
| PictBridge Compliant: | Yes | No |
| DPOF Compliant: | Yes | No |
| Remote Control: | Yes | Yes |
| Remote Control Type: | Wired or wireless | Optional wired or wireless |
| Connections (extended): | DC input, Multi-connector, Sync termimal, Remote terminal, HDMI Type-C minijack | Micro (Type-D) HDMI, DC input, Stereo microphone jack, wired remote socket |
| Performance Timing | ||
| Cycle time for JPEG shooting in single shot mode (seconds per frame, max resolution): | 0.40 | 0.35 |
| Cycle time for RAW shooting in single shot mode (seconds per frame): | 0.41 | 0.33 |
| Buffer size for RAW shooting in single shot mode (frames): | 15 | 10 |
| Cycle time for RAW+JPEG shooting in single shot mode (seconds per shot): | 0.33 | |
| Camera penalizes early shutter press? | No | Yes |
| JPEG shooting speed in burst mode (fps, max resolution): | 5.0 | 3.1 |
| Buffer size for JPEG shooting in burst mode (frames, max resolution): | 11 | 12 |
| RAW shooting speed in burst mode (fps): | 3.1 | |
| Buffer size for RAW shooting in burst mode (frames): | 10 | |
| RAW+JPEG shooting speed in burst mode (fps): | 3.1 | |
| Buffer Size for RAW+JPEG shooting in burst mode (frames): | 10 | |
| Shutter lag (full AF, wide/mid): | 0.18 seconds | 0.16 seconds |
| Shutter lag (full AF, tele): | ||
| Shutter lag (full AF, live view - DSLR): | 1.17 seconds | |
| Shutter lag (prefocused, live view - DSLR): | 0.385 seconds | |
| Shutter Lag (manual focus): | 0.153 seconds | 0.117 seconds |
| Shutter lag (full AF, with flash): | ||
| Shutter Lag (prefocused): | 0.072 seconds | 0.112 seconds |
| Shutter Lag (notes): | OVF: Full AF lag, wide-area mode = 0.170s Live View: Full AF lag, Spot AF mode = 1.174s Prefocused = 0.385s | |
| Startup Time: | 0.5 seconds | 1.5 seconds |
| Play -> Record Time: | 0.3 seconds | 0.7 seconds |
| Flash cycle time, full power: | ||
| Power | ||
| Battery Life, Stills (CIPA Rating Monitor/Live View): | ||
| Battery Life, Still (CIPA Rating OVF/EVF): | 880 shots | 650 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). | |
| 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. | New 51.4MP AA-filterless CMOS sensor, PRIME III processor, 27-point SAFOX 11 AF, 86K RGB metering, Full HD video up to 60i, tilting LCD monitor with Live View, 3fps full-res continuous burst mode. |
