OM SYSTEM OM-3 vs OM SYSTEM OM-3 ASTRO
Better figure, where one is clearly better
| OM SYSTEMOM-3 | OM SYSTEMOM-3 ASTRO | |
|---|---|---|
| Overview | ||
| Released | February 2025 | February 2026 |
| Image and sensor | ||
| Camera type | Mirrorless | Mirrorless |
| Sensor format | Four Thirds | Four Thirds |
| Sensor type | Stacked BSI Live MOS | Stacked BSI Live MOS |
| Sensor dimensions | 17.3 × 13 mm | 17.3 × 13 mm |
| Effective resolution | 20.4 MP | 20.4 MP |
| Largest image | 5184 × 3888 | 5184 × 3888 |
| RAW recording | Yes | Yes |
| Standard ISO range | 80–102400 | – |
| Sensor detail | UK 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 composites | Approximately 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 formats | ORF RAW and JPEG; high-resolution modes combine eight exposures and can save composite RAW; moving subjects and capture conditions affect results | Ordinary 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 detail | Maker 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 sensitivity | Maker UK manual and Auto range extends from LOW approximately ISO 80 to 102400, Auto upper default 25600; maker Japan lists standard maximum 25600 |
| Image processor | TruePic X | TruePic X |
| Lens and shooting | ||
| Lens mount | Micro Four Thirds | Micro Four Thirds |
| Stabilisation | Lens and sensor shift | Lens and sensor shift |
| Maximum continuous burst | 120 fps | 120 fps |
| Lens detail | Native Micro Four Thirds mount; Sync IS and fastest continuous tracking depend on compatible lenses; kit lens is excluded from body specifications | – |
| Autofocus | 1053 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) | 1053 cross-type phase detection positions and 1053 contrast positions; Starry Sky AF plus human, bird, animal and vehicle recognition |
| Shutter | Mechanical focal-plane 1/8000–60 seconds and Bulb up to 30 minutes; electronic high-speed modes have additional restrictions | Mechanical 1/8000–60 seconds; electronic 1/32000–60 seconds; Bulb up to 30 minutes and Live Composite |
| Burst detail | Electronic 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 fps | Mechanical 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 detail | Five-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 off | Five-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 |
| Flash | External 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 controls | PASM, 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 apply | C1/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 resolution | 4096 × 2160 at 60 fps | 4096 × 2160 at 60 fps |
| Video detail | Internal 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 mode | Internal 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 |
| Audio | Maker MOV settings include 48 kHz/16-bit and 96 kHz/24-bit; external 3.5 mm microphone and headphone connections | Stereo microphones; 3.5 mm external microphone and headphone sockets; 48 kHz/16-bit or 96 kHz/24-bit PCM |
| Screen and viewfinder | ||
| Viewfinder | Electronic | Electronic |
| Screen size | 3″ | 3″ |
| Screen dots | 1,620,000 | 1,620,000 |
| Touchscreen | Yes | Yes |
| Tilting screen | Yes | Yes |
| Display detail | Fully articulated three-inch touchscreen, approximately 1.62 million dots; connected port cables can restrict rotation (Amateur Photographer) | Fully articulated 3-inch approximately 1.62-million-dot touchscreen |
| Viewfinder detail | OLED 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 magnification | OLED 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-Fi | Yes | Yes |
| Bluetooth | Yes | Yes |
| Battery life (maker's claim) | 590 photographs | 590 photographs |
| Body weight | 413 g | 413 g |
| Release detail | Maker 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 date | Japan on sale 27 February 2026, made to order; month precision retained because the exact first sale in other regions is unconfirmed |
| Recording media | One SD/SDHC/SDXC slot with UHS-I and UHS-II support | One SD/SDHC/SDXC slot; UHS-I and UHS-II |
| Ports | USB 3 Type-C, Type D micro-HDMI, 3.5 mm microphone and headphone connections; maker launch release explicitly says wired remote operation is unsupported | 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 connections | Wi-Fi and Bluetooth Low Energy 5.2; optional RM-WR2 remote support; GPS tagging uses smartphone location, not an inferred built-in receiver | Bluetooth Low Energy 5.2 and Wi-Fi; location tagging from smartphone GPS; RM-WR2 Bluetooth remote, RM-WR1 unsupported |
| Battery life detail | BLX-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 disabled | BLX-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 |
| Charging | In-camera USB charging and USB Power Delivery bus power; charger not included, optional BCX-1 dual charger and F-5AC/F-7AC adapters | In-camera USB charging and USB PD bus power; can operate while charging, subject to supply capability |
| Dimensions | Approximately 139.3 × 88.9 × 45.8 mm, excluding protrusions | Approximately 139.3×88.9×45.8 mm excluding protrusions |
| Weight detail | Approximately 413 g body only or 496 g including battery and memory card; photographed 12–45mm kit lens excluded | Approximately 413 g body only or 496 g with battery and card; maker Japan loaded figure excludes eyecup |
| Materials | Magnesium 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 rating | IP53 or IPX1 depending on attached lens; operating temperature −10 to 40°C. Not an immersion rating |
| Colours | Silver-and-black body | Silver and black body with red ASTRO badge |
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