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

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 ASTRO
Overview
ReleasedFebruary 2024February 2026
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 range80–102400–
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 modesApproximately 20.37 effective megapixels (maker Japan), rounded to 20.4 in UK table; 22.9 total megapixels. Modified infrared-cut filter transmits approximately 100% at Hα 656 nm and SII 672 nm (maker Japan illustration, not a guaranteed spectral curve)
Image formatsJPEG and ORF RAW; tripod 80 MP and handheld 50 MP high-resolution composites offer 12-bit or 14-bit RAW, with movement restrictionsOrdinary JPEG and 12-bit RAW at 5184×3888; composite output up to 50 MP handheld or 80 MP tripod, with 12/14-bit high-resolution RAW. Composite resolution is not native sensor resolution
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 manual and Auto range extends from LOW approximately ISO 80 to 102400, Auto upper default 25600; maker Japan lists standard maximum 25600
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
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 phase detection positions and 1053 contrast positions; Starry Sky AF plus human, bird, animal and vehicle recognition
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 up to 30 minutes and Live Composite
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 headlineMechanical approximately 6 fps; electronic approximately 20 fps, SH1 up to 120 fps with focus/exposure fixed at first frame, SH2 up to 50 fps with compatible lenses. Maker examples at 120 fps 88 RAW/90 JPEG, at 50 fps 102 RAW/125 JPEG, with specified KIOXIA card and 12–40mm F2.8 PRO II
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 rated up to 6.5 central/5.5 corner stops with 12–45mm F4 PRO at 45mm; Sync IS up to 7.5 central/6.5 corner with 12–100mm F4 IS PRO at 100mm and half-press stabilisation 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 applyC1/C2 astrophotography presets, C3 handheld night scenes; 12-shot astrophotography stacking and star-motion alignment. Generic high-resolution table also describes an eight-shot mode. Live ND up to ND64, Live GND, HDR, focus stacking and Live Composite
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 or HEVC/H.265 MOV. H.264 table specifies 8-bit 4:2:0; OM-Log400, HLG and OM-Cinema1/2 profiles. Separate FHD high-speed up to 240 fps; HDMI 12-bit RAW is external output, not internal recording
AudioInternal stereo microphones, external 3.5 mm microphone and headphone connectionsStereo microphones; 3.5 mm external microphone and headphone sockets; 48 kHz/16-bit or 96 kHz/24-bit PCM
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 3-inch approximately 1.62-million-dot touchscreen
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× magnification with 50mm lens at infinity at −1 dioptre, depending on finder style
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 dateJapan on sale 27 February 2026, made to order; month precision retained because the exact first sale in other regions is unconfirmed
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 3 Type-C, micro-HDMI Type D, 3.5 mm microphone/headphone sockets, hot shoe and flash sync socket; no wired remote-release input (Amateur Photographer)
Wireless connectionsWi-Fi a/b/g/n/ac and Bluetooth Low Energy 4.2; smartphone location tagging, not built-in GPSBluetooth Low Energy 5.2 and Wi-Fi; location tagging from smartphone GPS; RM-WR2 Bluetooth remote, RM-WR1 unsupported
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 or 1040 Quick Sleep shots with specified KIOXIA card; approximately 120 minutes CIPA video or 190 minutes 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 PD bus power; can operate while charging, subject to supply capability
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 with battery and card; maker Japan loaded figure excludes eyecup
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 or IPX1 depending on attached lens; operating temperature −10 to 40°C. Not an immersion rating
ColoursBlackSilver and black body with red ASTRO badge

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