OM System
OM-3 ASTRO
Astrophotography-focused OM-3 variant with 20.4MP stacked sensor, H-alpha-friendly filter tuning, IP53 sealing, and 7.5-stop Sync IS.
$2,499
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Last updated May 2026
Key specs at a glance
Resolution
20.4 MP
Sensor
MFT
ISO max
102,400
Burst
120 fps
4K
60 fps
IBIS
6.5-stop
Weight
496 g
Battery
640 shots
Where to buy the OM System OM-3 ASTRO
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Sensor size
OM System OM-3 ASTRO
17.4 × 13 mm · Compact / large-type
226 mm² area
Lens ecosystem
Micro Four Thirds mount
60
First-party
70
Third-party
130+
Total available
Mount introduced 2008
Body size, to scale
Front view
Width × Height
Credit card
85.6 × 54 mm
Back view
Width × Height — same proportions as the front
Credit card
85.6 × 54 mm
Top view
Width × Depth (front-to-back)
Credit card
85.6 × 54 mm
139 × 89 × 46 mm · 496 g (1.09 lb / 17.50 oz)
Best for
Use-case scores
Scored algorithmically from verified specs. 10 = best in class.
Portrait
Fair- · Eye AF locks focus on subjects reliably
- · In-body stabilization for handheld shooting
Sports & Action
Excellent- · 120fps burst — pro-level action capture
- · 1,053 AF points — dense tracking grid
Video & Hybrid
Fair- · 4K recording
- · 4K 60p smooth motion
Landscape
Limited- · Weather sealed for outdoor conditions
- · IBIS enables slower handheld shutter speeds
Travel
Excellent- · 496g — ultralight for all-day carry
- · 640 shots/charge — all-day shooting
Wildlife
Good- · 120fps burst captures fleeting moments
- · Weather sealed for field conditions
Vlogging
Good- · 496g — easy to handhold for selfie video
- · 4K 60p for smooth handheld vlogs
Pros
- ✓ Astro-tuned sensor filter
- ✓ 20.4MP stacked BSI Live MOS
- ✓ IP53 weather sealing
- ✓ 7.5-stop Sync IS
Cons
- – Specialized astro variant
- – Micro Four Thirds sensor
- – Premium price
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Full specifications
Verified specs · OM System OM-3 ASTRO