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OM SYSTEM OM-1 Mark II vs OM SYSTEM OM-3

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

OM SYSTEMOM-1 Mark IIOM SYSTEMOM-3
Overview
ReleasedFebruary 2024February 2025
Image and sensor
Camera typeMirrorlessMirrorless
Sensor formatFour ThirdsFour Thirds
Sensor typeStacked BSI Live MOSStacked BSI Live MOS
Sensor dimensions17.3 × 13 mm17.3 × 13 mm
Effective resolution20.4 MP20.4 MP
Largest image5184 × 38885184 × 3888
RAW recordingYesYes
Standard ISO range80–10240080–102400
Sensor detailUK rounds resolution to 20.4 effective and 22.9 total megapixels; stacked BSI Live MOS. Ordinary single-shot output 5184×3888, separate from composite high-resolution modesUK specification rounds effective resolution to 20.4 MP and total to 22.9 MP; maker US press release specifies 20.37 effective and 22.93 total. 5184×3888 single-shot output, separate from 80 MP tripod or 50 MP handheld pixel-shift composites
Image formatsJPEG and ORF RAW; tripod 80 MP and handheld 50 MP high-resolution composites offer 12-bit or 14-bit RAW, with movement restrictionsORF RAW and JPEG; high-resolution modes combine eight exposures and can save composite RAW; moving subjects and capture conditions affect results
ISO detailHeadline range includes expanded LOW approximately ISO 80. Maker Japan specifies LOW 80/100 and ISO 200–102400; default Auto upper limit 25600. Amateur Photographer describes 200–25600 as native and higher settings as expandedMaker UK published sensitivity range includes LOW, approximately ISO 80, through ISO 102400; default Auto upper limit ISO 25600. This headline range includes expanded settings, rather than implying ISO 80 is the native base sensitivity
Image processorTruePic XTruePic X
Lens and shooting
Lens mountMicro Four ThirdsMicro Four Thirds
StabilisationLens and sensor shiftLens and sensor shift
Maximum continuous burst120 fps120 fps
Lens detail–Native Micro Four Thirds mount; Sync IS and fastest continuous tracking depend on compatible lenses; kit lens is excluded from body specifications
AutofocusHybrid phase/contrast, 1053 cross-type phase positions; human, bird, dog/cat, vehicle, aircraft and train recognition. UK sensitivity −8 EV with f/1.2 lens at approximately ISO 100; Japan −5.5 EV with f/2.8 uses different conditions1053 cross-type sensor phase-detection and contrast positions; AI recognition for humans, birds, cats/dogs, motorsports, aircraft and trains; EV −8 to 19 at approximately ISO 100 with an f/1.2 lens. Subject type is selected manually (Amateur Photographer)
ShutterMechanical 1/8000–60 seconds, electronic 1/32000–60 seconds; manufacturer mechanical durability rating 400000 actuationsMechanical focal-plane 1/8000–60 seconds and Bulb up to 30 minutes; electronic high-speed modes have additional restrictions
Burst detailElectronic SH1 120 fps fixes focus/exposure; SH2 up to 50 fps tracking requires compatible lenses. Mechanical 10 fps. Maker Japan example buffer 213 RAW/219 JPEG at 120 fps and 256/309 at 50 fps, with specified KIOXIA card and 12–40mm F2.8 PRO; UK older small-buffer rows conflict with its own 213-frame headlineElectronic SH1 up to 120 fps with focus/exposure fixed; SH2 up to 50 fps tracking with specified compatible lenses, no slow shutter or flash. Maker example buffer at 120 fps is 88 RAW/90 large fine JPEG, versus 102/125 at 50 fps and 151/375 at 20 fps, with specified KIOXIA card and 12–40mm F2.8 PRO II. Mechanical approximately 6 fps
Stabilisation detailFive-axis sensor shift; UK CIPA claim up to 8.5 stops with 12–40mm F2.8 PRO II at 40mm. Compatible Sync IS up to 8.5 with 150–400mm F4.5 TC1.25x IS PRO at 150mm, half-press IS off and high frame rateFive-axis sensor shift, CIPA 2024 up to 6.5 centre/5.5 corner stops with 12–45mm F4 PRO at 45mm; compatible Sync IS up to 7.5/6.5 with 12–100mm F4 IS PRO at 100mm and half-press stabilisation off
Flash–External hot-shoe flash support. Maker interface table lists a sync socket, while the read review's port discussion does not; no assumed connector shape
Exposure controlsLive ND2–128 and graduated ND2/4/8; Live Composite, focus stacking and pixel-shift modes. Live ND and GND cannot be combined (both reviews); mode, shutter and ISO restrictions applyPASM, five saved custom modes, front colour/monochrome profile dial and CP button. Live ND to ND64; Live GND to GND8. Restrictions on mode, flash, ISO and shutter apply
Video
Highest video resolution4096 × 2160 at 60 fps4096 × 2160 at 60 fps
Video detailInternal C4K 4096×2160 and UHD up to 60p; H.264 8-bit or HEVC 10-bit modes with OM-Log400 and HLG. FHD high-speed 240 fps is separate. External RAW HDMI needs a compatible recorder, rather than being internal RAW recordingInternal C4K 4096×2160 or UHD 3840×2160 up to 60p; H.264 and HEVC MOV formats, OM-Log400, HLG and OM-Cinema profiles. FHD high-speed 240 fps is separate from 4K. External 12-bit RAW HDMI needs a recorder and disables internal recording. Maker thermal claim of 30 minutes at 40°C or no thermal time limit at 25°C applies specifically to 4K30 10-bit testing, not every mode
AudioInternal stereo microphones, external 3.5 mm microphone and headphone connectionsMaker MOV settings include 48 kHz/16-bit and 96 kHz/24-bit; external 3.5 mm microphone and headphone connections
Screen and viewfinder
ViewfinderElectronicElectronic
Screen size3″3″
Screen dots1,620,0001,620,000
TouchscreenYesYes
Tilting screenYesYes
Display detailFully articulated three-inch touchscreen; headphone and lower-port cables can restrict rotation (Amateur Photographer)Fully articulated three-inch touchscreen, approximately 1.62 million dots; connected port cables can restrict rotation (Amateur Photographer)
Viewfinder detailOLED approximately 5.76 million dots, approximately 100% coverage; maximum 1.65× with 50mm lens at infinity at −1 dioptre, depending on finder style. Launch press 0.83× is full-frame-equivalent magnificationOLED approximately 2.36 million dots, 100% coverage, maximum 1.37× with 50mm lens at infinity and −1 dioptre depending on finder style; review figures near 0.68× are full-frame-equivalent magnification
Connections and design
Wi-FiYesYes
BluetoothYesYes
Battery life (maker's claim)500 photographs590 photographs
Body weight511 g413 g
Release detailMaker US launch release confirms late February 2024 sale; earliest worldwide day unconfirmed, so month precision retained. Its June 2025 PDF upload path is not the release dateMaker US press release confirms late February 2025 availability; earliest UK/worldwide retail day unconfirmed, so month precision retained. Press PDF's June upload path is not the release date
Recording mediaTwo SD/SDHC/SDXC slots, UHS-I and UHS-II; no CFexpress supportOne SD/SDHC/SDXC slot with UHS-I and UHS-II support
PortsUSB 3.0 SuperSpeed Type-C, micro-HDMI Type D, 2.5 mm remote, 3.5 mm microphone/headphone, hot shoe and flash sync socket (maker Japan)USB 3 Type-C, Type D micro-HDMI, 3.5 mm microphone and headphone connections; maker launch release explicitly says wired remote operation is unsupported
Wireless connectionsWi-Fi a/b/g/n/ac and Bluetooth Low Energy 4.2; smartphone location tagging, not built-in GPSWi-Fi and Bluetooth Low Energy 5.2; optional RM-WR2 remote support; GPS tagging uses smartphone location, not an inferred built-in receiver
Battery life detailBLX-1; maker Japan approximately 500 standard or 1010 low-power CIPA shots with specified KIOXIA card, IS on and no flash. UK table gives 520/1100 and its overview 500, so Japanese explicit conditions are used. JEITA video approximately 90 minutes, or 150 without other operationsBLX-1; approximately 590 standard-mode shots or 1040 Quick Sleep shots with specified KIOXIA UHS-II card. Maker video figures 120 minutes CIPA or 190 with zoom and other operations disabled
ChargingIn-camera USB charging with power off; USB Power Delivery bus power supported, revision 3.0 version 1.0aIn-camera USB charging and USB Power Delivery bus power; charger not included, optional BCX-1 dual charger and F-5AC/F-7AC adapters
DimensionsApproximately 134.8×91.6×72.7 mm excluding protrusions (maker Japan); UK table gives conflicting 138.8 mm widthApproximately 139.3 × 88.9 × 45.8 mm, excluding protrusions
Weight detailApproximately 511 g body only or 599 g with battery/card and without eyecup (maker Japan); photographed kit lens excludedApproximately 413 g body only or 496 g including battery and memory card; photographed 12–45mm kit lens excluded
MaterialsMagnesium-alloy body, −10 to 40°C operation; IP53 with specified IP53 lens or IPX1 with IPX1 lens. Weather resistance is not an immersion ratingMagnesium alloy, −10 to 40°C operation; IP53 or IPX1 performance depends on attached lens. Maker weather qualification excludes charging and HDMI connection, and is not an immersion rating
ColoursBlackSilver-and-black body

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