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OM SYSTEM OM-3 vs OM SYSTEM PEN

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

Better figure, where one is clearly better

OM SYSTEMOM-3OM SYSTEMPEN
Overview
ReleasedFebruary 2025Coming 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 range80–102400200–25600
Sensor detailUK 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 compositesApproximately 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 formatsORF RAW and JPEG; high-resolution modes combine eight exposures and can save composite RAW; moving subjects and capture conditions affect resultsJPEG 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 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 sensitivityISO 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
Lens detailNative Micro Four Thirds mount; Sync IS and fastest continuous tracking depend on compatible lenses; kit lens is excluded from body specifications–
Autofocus1053 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)Sensor 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 focal-plane 1/8000–60 seconds and Bulb up to 30 minutes; electronic high-speed modes have additional restrictionsMechanical 1/4000–60 seconds; electronic 1/32000–60 seconds; Bulb, Live Time and Live Composite modes
Burst detailElectronic 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 fpsElectronic 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, 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 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
FlashExternal 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 controlsPASM, 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 applyPASM, 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 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 modeInternal 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)
AudioMaker MOV settings include 48 kHz/16-bit and 96 kHz/24-bit; external 3.5 mm microphone and headphone connectionsBuilt-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 three-inch touchscreen, approximately 1.62 million dots; connected port cables can restrict rotation (Amateur Photographer)Fully articulated 3-inch approximately 1.04-million-dot touchscreen; touchscreen menu operation
Viewfinder detailOLED 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 magnificationOLED 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 detailMaker 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 dateMaker 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 with UHS-I and UHS-II supportOne SD/SDHC/SDXC slot; UHS-I
PortsUSB 3 Type-C, Type D micro-HDMI, 3.5 mm microphone and headphone connections; maker launch release explicitly says wired remote operation is unsupportedUSB 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 connectionsWi-Fi and Bluetooth Low Energy 5.2; optional RM-WR2 remote support; GPS tagging uses smartphone location, not an inferred built-in receiverWi-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-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 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 Power Delivery bus power; charger not included, optional BCX-1 dual charger and F-5AC/F-7AC adaptersIn-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 including battery and memory card; photographed 12–45mm kit lens excluded344 g body only or 393 g including battery and card (maker Japan); pictured kit lens excluded. CameraLabs pre-production dimensions and loaded weight differ
MaterialsMagnesium 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 ratingDust-resistant and IPX1 splash resistance with an OM SYSTEM splashproof lens; not an immersion rating. Operating temperature 0–40°C
ColoursSilver-and-black bodyBlack and silver

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