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OM SYSTEM OM-3 ASTRO vs OM SYSTEM PEN

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

Better figure, where one is clearly better

OM SYSTEMOM-3 ASTROOM SYSTEMPEN
Overview
ReleasedFebruary 2026Coming late October 2026 (Japan and North America)
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)Approximately 20.37 effective and 21.77 total megapixels; 17.4×13 mm in maker Japan table. Ordinary output 5184×3888; not a stacked sensor
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; handheld composite 50 MP, tripod composite up to 80 MP RAW developed with OM Workspace, not single-shot sensor resolution
ISO detailMaker UK manual and Auto range extends from LOW approximately ISO 80 to 102400, Auto upper default 25600; maker Japan lists standard maximum 25600ISO 200–25600 with expanded LOW approximately 64 and 100; default Auto upper limit 6400
Image processorTruePic XTruePic IX
Lens and shooting
Lens mountMicro Four ThirdsMicro Four Thirds
StabilisationLens and sensor shiftSensor 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 recognitionSensor phase/contrast detection with 121 cross-type phase positions; human, cat and dog recognition for stills, face/eye detection for video; Starry Sky AF
ShutterMechanical 1/8000–60 seconds; electronic 1/32000–60 seconds; Bulb up to 30 minutes and Live CompositeMechanical 1/4000–60 seconds; electronic 1/32000–60 seconds; Bulb, Live Time 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 high approximately 30 fps with fixed focus/exposure, low approximately 8 fps with tracking; mechanical approximately 5 fps. Maker examples at electronic 30 fps give 20 RAW/20 JPEG frames, tracking 8 fps 23 RAW/48 JPEG, with specified SanDisk card and 12–40mm F2.8 PRO II
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; CIPA 2024 up to 5.5 stops at centre and 4.5 at edges with 14–42mm F3.5–5.6 III at 42mm
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, Live ND2–16, focus stacking, HDR and multiple exposure; restrictions depend on shooting mode and lens
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 H.264 MOV C4K 4096×2160 at 24p or UHD 3840×2160 at 30/25/24p; 8-bit recording (both reviews). OM-Log400 and OM-Cinema1/2 profiles; separate FHD S&Q up to 120 fps, with crop, no sound and no continuous AF (CameraLabs)
AudioStereo microphones; 3.5 mm external microphone and headphone sockets; 48 kHz/16-bit or 96 kHz/24-bit PCMBuilt-in stereo microphones; external 3.5 mm microphone socket; 48 kHz/16-bit or 96 kHz/24-bit audio
Screen and viewfinder
ViewfinderElectronicElectronic
Screen size3″3″
Screen dots1,620,0001,040,000
TouchscreenYesYes
Tilting screenYesYes
Display detailFully articulated 3-inch approximately 1.62-million-dot touchscreenFully articulated 3-inch approximately 1.04-million-dot touchscreen; touchscreen menu operation
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 and 100% coverage; 1.10–1.23× magnification with 50mm lens at infinity, depending on finder style
Connections and design
Wi-FiYesYes
BluetoothYesYes
Battery life (maker's claim)590 photographs410 photographs
Body weight413 g344 g
Release detailJapan on sale 27 February 2026, made to order; month precision retained because the exact first sale in other regions is unconfirmedMaker announcement 9 September 2026; Japan and North America scheduled for late October 2026. UK product page has an active preorder state on 2 October; first UK sale date unconfirmed
Recording mediaOne SD/SDHC/SDXC slot; UHS-I and UHS-IIOne SD/SDHC/SDXC slot; UHS-I
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, micro-HDMI Type D, 3.5 mm microphone socket and hot shoe; USB-C is not a USB 3 transfer-speed claim
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; smartphone GPS 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-7; approximately 410 CIPA shots using EVF or LCD; approximately 80 minutes CIPA video or 130 minutes with zoom and other operations disabled
ChargingIn-camera USB charging and USB PD bus power; can operate while charging, subject to supply capabilityIn-camera USB charging with camera off; no USB Power Delivery (maker Japan)
DimensionsApproximately 139.3×88.9×45.8 mm excluding protrusionsApproximately 125.8×74.5×43.3 mm excluding protrusions (maker Japan)
Weight detailApproximately 413 g body only or 496 g with battery and card; maker Japan loaded figure excludes eyecup344 g body only or 393 g including battery and card (maker Japan); pictured kit lens excluded. CameraLabs pre-production dimensions and loaded weight differ
MaterialsIP53 or IPX1 depending on attached lens; operating temperature −10 to 40°C. Not an immersion ratingDust-resistant and IPX1 splash resistance with an OM SYSTEM splashproof lens; not an immersion rating. Operating temperature 0–40°C
ColoursSilver and black body with red ASTRO badgeBlack and silver

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