Side by side comparison and review of Pentax 645Z and Olympus OM System 1. Compare design, sensors, zoom functions, batteries and other key specifications and features to simplify the choice of your perfect digital camera. Our goal is to make it easier for you to decide on the camera that will best meet your expectations by revealing the main differences between the products.
| DESIGN AND DIMENSIONS | Pentax 645Z | Olympus OM System 1 |
|---|
| Product Type | Digital camera - 1080p - SLR with Live View mode, movie recording | Digital camera - 4K - mirrorless system |
|---|---|---|
| Lens Included | Body only | Body only |
| Height | 11.7 cm | 9.16 cm |
| Width | 15.6 cm | 13.48 cm |
| Depth | 12.3 cm | 7.27 cm |
| Weight | 1.47 kg | 511 g |
| Weight Details | Camera body only: 1.47 kg Camera with battery and memory card: 1.55 kg |
Camera body only: 511 g Camera with battery and memory card: 599 g |
| Protection | Dust-resistant, water-resistant | Splashproof, freezeproof, dust-proof, IP53 |
| SENSOR | Pentax 645Z | Olympus OM System 1 |
|---|
| Sensor Resolution | 51.4 Megapixel | 20.4 Megapixel |
|---|---|---|
| Optical Sensor Type | CMOS | Stacked BSI Live MOS |
| Total Pixels | 52,990,000 pixels | 22,900,000 pixels |
| Effective Sensor Resolution | 51,400,000 pixels | 20,400,000 pixels |
| Optical Sensor Size | - | Four Thirds (4/3") |
| Frame Rate (Max Resolution) | 30 fps | 30 fps |
| Sensor Dust Reduction | Yes | Yes |
| Sensor Features | Dust Reduction (image sensor vibration) | Supersonic Wave Filter (SWF) |
| Image Stabiliser | - | Optical (5-axis image sensor shift mechanism) |
| Built-in Optical Image Stabiliser | - | Yes |
| Sensors | - | Digital level metre |
| PROCESSOR | Pentax 645Z | Olympus OM System 1 |
|---|
| Image Processor | - | TruePic X |
|---|
| LENS | Pentax 645Z | Olympus OM System 1 |
|---|
| Lens Mounting Type | Pentax 645AF | Micro Four Thirds |
|---|
| FOCUSING | Pentax 645Z | Olympus OM System 1 |
|---|
| Auto Focus | TTL contrast and phase detection | TTL contrast and phase detection |
|---|---|---|
| Auto Focus Points (Zones) Qty | 27 | 1053 |
| Auto Focus Features | - | Focus Peaking function |
| AE/AF Control | - | AI Focus AF |
| Face Detection | - | Eye Detect AF, Face Detection AF/AE |
| VIEWFINDER | Pentax 645Z | Olympus OM System 1 |
|---|
| Viewfinder Type | Optical - trapezoid prism | Electronic - OLED |
|---|---|---|
| Viewfinder Colour Support | - | Colour |
| Viewfinder Resolution | - | 5,760,000 pixels |
| Optical Viewfinder Field Coverage | 98% | 100% |
| Optical Viewfinder Magnification | 0.62x | - |
| Optical Viewfinder Dioptric Correction Range | -3.5 to +2 | -4 to +2 |
| Field of View Crop Factor | 1.3 | 2 |
| EXPOSURE & WHITE BALANCE | Pentax 645Z | Olympus OM System 1 |
|---|
| ISO (Max) | 204800 | 102400 |
|---|---|---|
| Native ISO | 100-204800 | - |
| Extended ISO (Max) | - | 102400 |
| Extended ISO (Min) | - | 80 |
| Light Sensitivity | ISO auto (100-204800), ISO 100-248000 | ISO 200-102400, ISO 80-102400 |
| Exposure Metering | Multi-segment, centre-weighted, spot | Multi-segment, centre-weighted, spot |
| Exposure Metering Zones | - | 324 |
| Exposure Modes | Programme, bulb, manual, aperture-priority, shutter-priority, ISO priority, shutter & aperture priority | - |
| Bracketing Modes | - | Art Filter bracketing, Dynamic Range Bracketing, focus bracketing, ISO sensitivity bracketing, Flash Exposure Bracketing, white balance bracketing |
| Special Effects | Natural, bright, Vibrant, monochrome, Muted, landscape, portrait, Cross Process, Bleach Bypass, Radiant, Reversal Film | Monotone, Vivid, soft focus, natural, Flat, portrait, Water Colour, Diorama, Cross Process, partial colour, Grainy Film, Light Tone, Pop Art, Pale & Light Colour, pin hole, Gentle Sepia, Dramatic Tone, Bleach Bypass, High Key, Low Key, Key Line, Vintage, Instant Film, Colour Creator, Underwater |
| White Balance | Custom, automatic, presets | Custom, automatic, presets |
| White Balance Presets | Tungsten light, Flash, daylight, shade, fluorescent light (cool white), fluorescent light (warm white), fluorescent light (daylight colour), fluorescent light (daylight white) | - |
| Shutter Type | Electronic | Mechanical, electronic |
| Max Shutter Speed | 1/4000 sec | 1/32000 sec |
| Min Shutter Speed | 30 sec | 60 sec |
| Exposure Compensation | ±5 EV range, in 1/2 or 1/3 EV steps | ±5 EV range, in 1/3 EV steps |
| White Balance Bracketing | - | Yes |
| X-sync Speed | 1/125sec | 1/250sec, 1/8000 sec |
| Exposure Range | EV -1-21 (ISO 200) | EV -5.5-19 (ISO 100) |
| DISPLAY | Pentax 645Z | Olympus OM System 1 |
|---|
| Type | 3.2" LCD display | 3" LCD display |
|---|---|---|
| Touch Screen | - | Yes |
| Display Format | 1,037,000 pixels | 1,620,000 pixels |
| Display Form Factor | Folding | Folding |
| Display Features | Display brightness control, display colour control | - |
| FLASH | Pentax 645Z | Olympus OM System 1 |
|---|
| Camera Flash | - | External flash |
|---|---|---|
| Flash Modes | - | Fill-in mode, slow synchro, flash OFF mode |
| Features | - | AF illuminator |
| VIDEOGRAPHY / CAMCORDER | Pentax 645Z | Olympus OM System 1 |
|---|
| Digital Video Format | MJPEG, H.264 | H.264, MOV, H.265, MPEG-4 AVC |
|---|---|---|
| Image Recording Format | JPEG, RAW, RAW + JPEG | JPEG, RAW, RAW + JPEG |
| Max Video Resolution | 1920 x 1080 | 4096 x 2160 |
| Audio Signal Format | - | Linear PCM |
| Microphone Operation Mode | - | Stereo |
| Microphone Features | - | Wind noise reduction |
| MEMORY | Pentax 645Z | Olympus OM System 1 |
|---|
| Memory Card Slot | Dual SD card | SD card |
|---|---|---|
| Supported Memory Cards | SD Memory Card, SDXC Memory Card, SDHC Memory Card, SDHC UHS-I Memory Card, SDXC UHS-I Memory Card | SD Memory Card, SDXC Memory Card, SDHC Memory Card, SDHC UHS-I Memory Card, SDXC UHS-I Memory Card, SDHC UHS-II Memory Card, SDXC UHS-II Memory Card |
| Memory Card Included | No | - |
| Image Storage | - | 5184 x 3888 |
| BATTERY AND CHARGING | Pentax 645Z | Olympus OM System 1 |
|---|
| Battery Type | Pentax D-Li90 Lithium Ion | Olympus BLX-1 Lithium Ion |
|---|---|---|
| Details | Pentax D-Li90 Li-ion rechargeable battery (included) | Olympus BLX-1 Li-ion rechargeable battery (included) |
| Battery Life | Photo shooting - 650 shots Playback - 6.67 hours |
- |
| CONNECTIONS | Pentax 645Z | Olympus OM System 1 |
|---|
| Interface | HDMI, USB 3.0 | HDMI, USB-C, IEEE 802.11b/g/n/ac, Bluetooth 4.2 |
|---|---|---|
| Print Standard | - | Exif Print support |
| Flash Terminal | Hot shoe | Hot shoe, PC terminal |
| Connector Type | USB 3.0 (24 pin Micro-USB-C) HDMI output (19 pin micro HDMI Type D) Microphone (mini-phone stereo 3.5 mm) DC power input |
USB 3.0 (USB Type-C) Remote control input (sub-mini phone 2.5 mm) HDMI output (19 pin micro HDMI Type D) Microphone (mini-phone stereo 3.5 mm) Headphones (mini-phone stereo 3.5 mm) |
| FEATURES | Pentax 645Z | Olympus OM System 1 |
|---|
| Self-Timer Delay | 2sec, 12sec | 2sec, 12sec, custom |
|---|---|---|
| Continuous Shooting Speed | 3 frames per second, 4.5 frames per second | 120 frames per second |
| Additional Features | RGB primary colour filter, interval shooting mode, peripheral illumination correction, Eye-Fi Card Ready, NR Slow Shutter, High ISO NR, Lateral Chromatic Aberration Correction, distortion correction function, anti-aliasing filter simulator, diffraction correction | Built-in speaker, auto power save, histogram display, in-camera red-eye removal, cropping an image, resizing an image, shadow point display, interval shooting mode, highlight point display, USB charging, in-camera RAW processing, HDR image enhancement technology, high-speed recording, Dual Axis Electronic Level, silent shooting, GPS via mobile, multiple exposure capture, Focus Stacking, anti-flicker, Hybrid Log-Gamma (HLG) recording, 80-megapixel High Resolution mode |
| OTHERS | Pentax 645Z | Olympus OM System 1 |
|---|
| Included Accessories | Carrying strap, battery charger, body cap, eyecup, shoe cap | Shoulder strap, AC power adaptor, USB cable, cable clip, cable protector |
|---|---|---|
| Software | Drivers & Utilities | - |
| Max Operating Temperature | - | 40 °C |
| Min Operating Temperature | - | -10 °C |
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