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OM SYSTEM OM-3 ASTRO · Maker front body photograph; red ASTRO badge is part of the product
OM SYSTEM · OM
OM-3 ASTRO
A 20.4-megapixel Micro Four Thirds mirrorless camera adapted for astrophotography, with increased hydrogen-alpha transmission, star-focusing autofocus and in-camera image stacking.
- Type
- Mirrorless
- Sensor
- Four Thirds
- Megapixels
- 20.4
- Lens
- Micro Four Thirds
- Video
- 4096 × 2160 at 60 fps
- Body weight
- 413 g
Specifications
Report a wrong or missing specImage and sensor
- Camera type
- Mirrorless
- Sensor format
- Four Thirds
- Sensor type
- Stacked BSI Live MOS
- Sensor dimensions
- 17.3 × 13 mm
- Effective resolution
- 20.4 MP
- Largest image
- 5184 × 3888
- RAW recording
- Yes
- Sensor detail
- 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
- 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 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
Lens and shooting
- Lens mount
- Micro Four Thirds
- Stabilisation
- Lens and sensor shift
- Maximum continuous burst
- 120 fps
- Autofocus
- 1053 cross-type phase detection positions and 1053 contrast positions; Starry Sky AF plus human, bird, animal and vehicle recognition
- Shutter
- Mechanical 1/8000–60 seconds; electronic 1/32000–60 seconds; Bulb up to 30 minutes and Live Composite
- Burst detail
- 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 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 controls
- 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
- Video detail
- 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
- 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
- Screen size
- 3″
- Screen dots
- 1,620,000
- Touchscreen
- Yes
- Tilting screen
- Yes
- Display detail
- Fully articulated 3-inch approximately 1.62-million-dot touchscreen
- Viewfinder detail
- 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
- Bluetooth
- Yes
- Battery life (maker's claim)
- 590 photographs
- Body weight
- 413 g
- Release detail
- 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; UHS-I and UHS-II
- Ports
- 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
- 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 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 PD bus power; can operate while charging, subject to supply capability
- Dimensions
- Approximately 139.3×88.9×45.8 mm excluding protrusions
- Weight detail
- Approximately 413 g body only or 496 g with battery and card; maker Japan loaded figure excludes eyecup
- Materials
- IP53 or IPX1 depending on attached lens; operating temperature −10 to 40°C. Not an immersion rating
- Colours
- Silver and black body with red ASTRO badge
Pros and cons
Pros
- Infrared-cut filter tuned for emission nebulae
- Starry Sky AF and night-view composition
- In-camera astrophotography stacking
Cons
- Maker discourages ordinary daylight photography
- One SD slot
- No wired shutter-release socket
Closest rivals
Model | Type | Sensor | Megapixels | Lens | Video | Body weight | Released |
|---|---|---|---|---|---|---|---|
| Mirrorless | Four Thirds | 20.4 | Micro Four Thirds | 4096 × 2160 at 24 fps | 344 g | Coming late October 2026 (Japan and North America) | |
| Mirrorless | Four Thirds | 20.3 | Micro Four Thirds | 3840 × 2160 at 30 fps | 478 g | Feb 2025 | |
| Mirrorless | Four Thirds | 20.4 | Micro Four Thirds | 4096 × 2160 at 60 fps | 413 g | Feb 2025 |
Sources
- explore.omsystem.com/gb/en/om-3-astro-body
- jp.omsystem.com/product/dslr/om-omd/om/om3_astro/index.html
- amateurphotographer.com/review/om-system-om-3-astro-field-test
- digitalcameraworld.com/photography/astrophotography/i-got-to-shoot-the-milky-wa…
Photo: Maker front body photograph; red ASTRO badge is part of the product
- OM System OM-3 ASTRO, rear view: Official maker product gallery photograph; body without lens; exterior body view published by the maker in both OM-3 and OM-3 ASTRO exact product galleries
- OM System OM-3 ASTRO, left side view: Official maker product gallery photograph; body without lens; exterior body view published by the maker in both OM-3 and OM-3 ASTRO exact product galleries
- OM System OM-3 ASTRO, right side view: Official maker product gallery photograph; body without lens; exterior body view published by the maker in both OM-3 and OM-3 ASTRO exact product galleries
- OM System OM-3 ASTRO, top view: Official maker product gallery photograph; body without lens; exterior body view published by the maker in both OM-3 and OM-3 ASTRO exact product galleries
- OM System OM-3 ASTRO, bottom view: Official maker product gallery photograph; body without lens; exterior body view published by the maker in both OM-3 and OM-3 ASTRO exact product galleries
