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OM SYSTEM OM-3 ASTRO 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-3 ASTROOM SYSTEMOM-5 Mark II
Overview
ReleasedFebruary 2026July 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 range–200–25600
Sensor detailApproximately 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)Maker 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 formatsOrdinary 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 resolutionJPEG 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 detailMaker UK manual and Auto range extends from LOW approximately ISO 80 to 102400, Auto upper default 25600; maker Japan lists standard maximum 25600Manual 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
Autofocus1053 cross-type phase detection positions and 1053 contrast positions; Starry Sky AF plus human, bird, animal and vehicle recognitionHybrid 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; Bulb up to 30 minutes and Live CompositeMechanical 1/8000–60 seconds; electronic 1/32000–60 seconds; Bulb and Live Composite modes
Burst detailMechanical 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 IIElectronic 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 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 offFive-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 controlsC1/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 CompositePASM 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 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 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
AudioStereo microphones; 3.5 mm external microphone and headphone sockets; 48 kHz/16-bit or 96 kHz/24-bit PCMInternal 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 3-inch approximately 1.62-million-dot touchscreenFully articulated touchscreen; UK table 1.037 million dots, Japan rounds to 1.04 million
Viewfinder detailOLED approximately 2.36 million dots, approximately 100% coverage; maximum 1.37× magnification with 50mm lens at infinity at −1 dioptre, depending on finder styleOLED 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)590 photographs310 photographs
Body weight413 g370 g
Release detailJapan on sale 27 February 2026, made to order; month precision retained because the exact first sale in other regions is unconfirmedMaker US release confirms early July 2025 retail; Japan 18 July local date. Earliest worldwide day unconfirmed, so month precision retained
Recording mediaOne SD/SDHC/SDXC slot; UHS-I and UHS-IIOne SD/SDHC/SDXC slot, UHS-I and UHS-II
PortsUSB 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)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 connectionsBluetooth Low Energy 5.2 and Wi-Fi; location tagging from smartphone GPS; RM-WR2 Bluetooth remote, RM-WR1 unsupportedWi-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; 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 disabledBLS-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 and USB PD bus power; can operate while charging, subject to supply capabilityIn-camera USB charging with power off; USB power supply supported, but no USB Power Delivery. Charger not supplied
DimensionsApproximately 139.3×88.9×45.8 mm excluding protrusionsApproximately 125.3×85.2×52 mm excluding protrusions (maker Japan and US launch); UK table gives conflicting 49.7 mm depth
Weight detailApproximately 413 g body only or 496 g with battery and card; maker Japan loaded figure excludes eyecupMaker 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
MaterialsIP53 or IPX1 depending on attached lens; operating temperature −10 to 40°C. 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
ColoursSilver and black body with red ASTRO badgeBlack, silver and sand beige; kit availability varies by region

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