Head to head · specs cited · drawn to scale
OM System OM-1 Mark II vs Sony A7 III
Every spec below is quoted from the makers' official pages — where a figure isn't published we say so rather than guess. Sizes are drawn at true relative scale from published dimensions, and the bag-fit row is computed against our measured bag catalog.
The 3 biggest published differences
- EVF resolution: the A7 III leads at 2,359,296 dots vs the OM-1 II's Approx. 5.76M dots.
- EVF magnification: the OM-1 II leads at Approx. 1.48x - 1.65x vs the A7 III's approx. 0.78x.
- In-body stabilisation: the OM-1 II leads at Up to 8.5 EV steps (Sync IS) vs the A7 III's 5.0 stops.
 OM-1 II Micro Four Thirds |  A7 III Sony E | |
|---|---|---|
| Overview | ||
| Type | Mirrorless | Mirrorless |
| Format | 4/3'' (Micro Four Thirds) | full frame |
| Lens mount | Micro Four Thirds | Sony E |
| Released | —, not published | —, not published |
| Sensor & Image | ||
| Sensor type | Stacked BSI Live MOS | 35 mm full frame (35.6 × 23.8 mm), Exmor R® CMOS sensor |
| Sensor size | 4/3'' (Micro Four Thirds) | full frame |
| Resolution (MP) | 20.4 | 24.2 |
| In-body stabilisation | Up to 8.5 EV steps (Sync IS) | 5.0 stops |
| ISO range | LOW - 102400 (native/manual range) | ISO 100-51200 (stills) |
| Autofocus & Speed | ||
| AF system | TTL phase difference detection + contrast detection, 1053 points / cross-type phase detection AF | 693-point phase-detection AF (35 mm full frame); Fast Hybrid AF (phase-detection AF/contrast-detection AF) |
| Subject detection | Aircrafts, Birds, Bullet trains, Cats, Dogs, Formula cars, Helicopters, Human, Motorcycles, Rally cars, Standard trains, Steam locomotives | Human eye (Eye AF) |
| Burst — mechanical | Approx. 10fps | 10 fps (Hi+) |
| Burst — electronic | Pro Capture SH1 approx. 120fps; SH2 approx. 50fps (213-frame RAW buffer at 120fps) | —, not published |
| Video | ||
| Max video | 4096x2160 (C4K) / 3840x2160 (4K) 60p | 4K 30p (3840 x 2160, XAVC S, 100 Mbps) |
| Codecs / sampling | MOV (MPEG-4AVC/H.264), MOV (HEVC/H.265) | XAVC S, AVCHD (MPEG-4 AVC/H.264) |
| Recording limit | Unlimited | Approx. 29 minutes (continuous movie recording limit) |
| Viewfinder & Screen | ||
| EVF resolution | Approx. 5.76M dots | 2,359,296 dots |
| EVF magnification | Approx. 1.48x - 1.65x | approx. 0.78x |
| Rear screen | 3.0 inch Vari-angle Touch LCD, approx. 1.62M dots | 2.95 inch (3.0-type) wide type TFT, 921,600 dots, tilt up approx. 107 degrees / down approx. 41 degrees, touch panel |
| Body & Handling | ||
| Dimensions (W×H×D) | 134.8 × 91.6 × 72.7 mm | 126.9 × 95.6 × 73.7 mm |
| Weight (body) | 599 g | 650 g |
| Weather sealing | IP53 certified; freezeproof to -10°C | Anti-Dust System: Charge protection coating on optical filter and image sensor shift mechanism |
| Shutter durability | 400,000 shots | —, not published |
| Power & Storage | ||
| Battery life (CIPA) | 520 shots (using BLX-1) | Approx. 610 shots (Viewfinder) / approx. 710 shots (LCD monitor) (CIPA standard) |
| Battery | BLX-1 Lithium-Ion Battery | NP-FZ100 |
| Card slots | SD Memory Card (SDHC, SDXC, UHS-I, UHS-II compatible) | 2 slots: SLOT1 SD (UHS-I/II compliant); SLOT2 Multi slot for Memory Stick Duo/SD (UHS-I compliant) |
| Connectivity | ||
| USB | USB 3 Type C | USB Type-C Terminal (SuperSpeed USB (USB 3.1 Gen 1) compatible); Multi/Micro USB Terminal |
| Wireless | Wi-Fi and Bluetooth | Wi-Fi Compatible, IEEE 802.11b/g/n (2.4 GHz band); Bluetooth Standard Ver. 4.1 (2.4 GHz band) |
| HDMI | Micro connector (Type D) | HDMI micro connector (Type-D) |
| Price | ||
| Launch price | $1,999.99 (body, as listed) | $1,999.99 (body only, USD; listed as "Original Price" on electronics.sony.com product page) |
| Size, to scale | ||
Front view, drawn at the same scale from each maker's published W×H (mm). | ||
| Smallest bag that fits | ||
| Body + standard zoom | Think Tank Mirrorless Mover 20 V2 Fits body only · View at B&H Photo Video | Think Tank Mirrorless Mover 25 V2 Fits with 24-105 f/4 · View at B&H Photo Video |
Sources
“4/3'' Stacked BSI Live MOS sensor, 20.4 Megapixels effective; Up to 8.5 EV steps image stabilization; 1053 points / cross-type phase detection AF; Pro Capture SH1 Approx. 120fps; From $1,999.99”
“Compensation Effect 5.0 stops (based on CIPA standard. Pitch/yaw shake only. With Planar T* FE 50mm F1.4 ZA lens mounted. Long exposure NR off.) TYPE Image Sensor-Shift mechanism with 5-axis compensation (compensation depends on lens specifications)”
Spec values are the manufacturers' published figures, compared factually — we don't rank cameras. Fit verdicts are planning estimates from published interior dimensions, not guarantees. See methodology.
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