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OM SYSTEM OM-1 Mark II vs OM SYSTEM OM-5 Mark II

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

Better figure, where one is clearly better

OM SYSTEMOM-1 Mark IIOM SYSTEMOM-5 Mark II
Overview
ReleasedFebruary 2024July 2025
Image and sensor
Camera typeMirrorlessMirrorless
Sensor formatFour ThirdsFour Thirds
Sensor typeStacked BSI Live MOSLive MOS
Sensor dimensions17.3 × 13 mm17.4 × 13 mm
Effective resolution20.4 MP20.4 MP
Largest image5184 × 38885184 × 3888
RAW recordingYesYes
Standard ISO range80–102400200–25600
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 modesMaker Japan specifies approximately 20.37 effective and 21.77 total megapixels, rounded to 20.4 and 21.8 in UK table. Japan gives 17.4×13 mm image area; UK gives 17.3×13 mm
Image formatsJPEG and ORF RAW; tripod 80 MP and handheld 50 MP high-resolution composites offer 12-bit or 14-bit RAW, with movement restrictionsJPEG and 12-bit losslessly compressed ORF RAW; ordinary output 5184×3888. Tripod composite RAW 10368×7776 needs OM Workspace for 80 MP development; handheld composite 50 MP, rather than an 80 MP single-shot sensor
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 expandedManual ISO 200–25600, expanded LOW approximately 64 and 100; default Auto upper limit 6400 (maker Japan)
Image processorTruePic XTruePic IX
Lens and shooting
Lens mountMicro Four ThirdsMicro Four Thirds
StabilisationLens and sensor shiftLens and sensor shift
Maximum continuous burst120 fps30 fps
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 conditionsHybrid sensor phase/contrast, 121 cross-type phase positions; face/eye recognition and Starry Sky AF, without animal/vehicle subject recognition (both reviews)
ShutterMechanical 1/8000–60 seconds, electronic 1/32000–60 seconds; manufacturer mechanical durability rating 400000 actuationsMechanical 1/8000–60 seconds; electronic 1/32000–60 seconds; Bulb and Live Composite modes
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 30 fps fixes focus/exposure at first frame; approximately 10 fps electronic tracking and 6 fps mechanical. Maker Japan example 30 fps buffer 19 RAW/21 JPEG with specified KIOXIA card and 12–40mm F2.8 PRO II; UK examples differ
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; maker CIPA 2024 up to 6.5 centre/5.5 corner stops with 12–45mm F4 PRO at 45mm. Sync IS up to 7.5/6.5 with 12–100mm F4 IS PRO at 100mm and half-press IS off
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 and computational-photography CP button; Live ND2–16, focus stacking, HDR and multiple exposures; mode, ISO, shutter, flash and compatible-lens restrictions apply
Video
Highest video resolution4096 × 2160 at 60 fps4096 × 2160 at 24 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 at 24p; UHD 3840×2160 at 30/25/24p; H.264 MOV, 8-bit recording (Amateur Photographer). FHD high-speed 120 fps is separate; OM-Log400 and OM-Cinema1/2 profiles
AudioInternal stereo microphones, external 3.5 mm microphone and headphone connectionsInternal stereo microphones, external 3.5 mm microphone input; 48 kHz/16-bit or 96 kHz/24-bit recording
Screen and viewfinder
ViewfinderElectronicElectronic
Screen size3″3″
Screen dots1,620,0001,037,000
TouchscreenYesYes
Tilting screenYesYes
Display detailFully articulated three-inch touchscreen; headphone and lower-port cables can restrict rotation (Amateur Photographer)Fully articulated touchscreen; UK table 1.037 million dots, Japan rounds to 1.04 million
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, approximately 100% coverage; maximum 1.37× with 50mm lens at infinity at −1 dioptre depends on finder style
Connections and design
Wi-FiYesYes
BluetoothYesYes
Battery life (maker's claim)500 photographs310 photographs
Body weight511 g370 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 release confirms early July 2025 retail; Japan 18 July local date. Earliest worldwide day unconfirmed, so month precision retained
Recording mediaTwo SD/SDHC/SDXC slots, UHS-I and UHS-II; no CFexpress supportOne SD/SDHC/SDXC slot, UHS-I and UHS-II
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 2.0 Hi-Speed Type-C without USB PD, micro-HDMI Type D, 3.5 mm microphone and 2.5 mm remote socket (maker Japan). UK USB 3 heading does not establish USB 3 transfer speed
Wireless connectionsWi-Fi a/b/g/n/ac and Bluetooth Low Energy 4.2; smartphone location tagging, not built-in GPSWi-Fi b/g/n and Bluetooth Low Energy 5.2 (maker Japan); UK Bluetooth 4.2 table conflicts. Smartphone location tagging, rather than built-in GPS
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 operationsBLS-50; 310 standard or 640 low-power CIPA shots with specified KIOXIA card. Approximately 60 minutes CIPA video or 100 minutes with other operations disabled; recording limited by card, battery and conditions
ChargingIn-camera USB charging with power off; USB Power Delivery bus power supported, revision 3.0 version 1.0aIn-camera USB charging with power off; USB power supply supported, but no USB Power Delivery. Charger not supplied
DimensionsApproximately 134.8×91.6×72.7 mm excluding protrusions (maker Japan); UK table gives conflicting 138.8 mm widthApproximately 125.3×85.2×52 mm excluding protrusions (maker Japan and US launch); UK table gives conflicting 49.7 mm depth
Weight detailApproximately 511 g body only or 599 g with battery/card and without eyecup (maker Japan); photographed kit lens excludedMaker Japan 370 g body only or 418 g with battery/card and without eyecup; UK body-only table gives conflicting 366 g. Photographed 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 ratingIP53 with specified IP53 lens, IPX1 with IPX1 lens; weather qualification excludes charging and HDMI. Operation −10 to 40°C; not an immersion rating
ColoursBlackBlack, silver and sand beige; kit availability varies by region

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