OM System

OM-3 ASTRO

Name: OM System OM-3 ASTRO
Brand: OM System
Price: 2499 USD
Availability: InStock

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

60 fps

IBIS

6.5-stop

Weight

496 g

Battery

640 shots

Sensor size

OM System OM-3 ASTRO

17.4 × 13 mm · Compact / large-type

226 mm² area

Lens ecosystem

Micro Four Thirds mount

First-party

Third-party

130+

Total available

Mount introduced 2008

Body size

OM System OM-3 ASTRO

139 × 89 × 46 mm

496 g (1.09 lb / 17.50 oz)

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

4.0/ 10

· Eye AF locks focus on subjects reliably
· In-body stabilization for handheld shooting

Sports & Action

Excellent

8.5/ 10

· 120fps burst — pro-level action capture
· 1,053 AF points — dense tracking grid

Video & Hybrid

Fair

5.5/ 10

· 4K recording
· 4K 60p smooth motion

Landscape

Limited

2.5/ 10

· Weather sealed for outdoor conditions
· IBIS enables slower handheld shutter speeds

Travel

Excellent

8.0/ 10

· 496g — ultralight for all-day carry
· 640 shots/charge — all-day shooting

Wildlife

Good

6.5/ 10

· 120fps burst captures fleeting moments
· Weather sealed for field conditions

Vlogging

Good

7.5/ 10

· 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

Sensor

Resolution20.4 MP

Sensor type4/3 Stacked BSI Live MOS

Sensor size17.4 x 13.0 mm

AA filterNo

Processor

ProcessorTruePic X

ISO

ISO min (native)80

ISO max (native)102,400

ISO max (expanded)102,400

Shutter

Shutter typeComputerised focal-plane shutter + electronic shutter

Max mechanical speed1/8000 sec

Max electronic speed1/32000 sec

Autofocus

AF system1053-point Cross Quad Pixel phase detection AF

AF points / zones1053

AF frame coverage100 %

AF low-light limit-8 EV

Eye AFYes

Animal / bird AFYes

Subject recognitionPeople, Birds, Animals, Motorsports, Airplanes, Trains

Burst

Burst (mechanical)10 fps

Burst (electronic)120 fps

Pre-Capture / Pre-ReleaseYes

Video

Max resolution4K / C4K

4K max frame rate60 fps

Max video bit rate150 Mbps

Internal RAW videoNo

Log profileOM-Log / HLG

CodecsH.264, H.265, MOV

Stabilization

In-body stabilizationYes

IBIS effectiveness6.5 stops

Body

Weight496 g

Dimensions (W×H×D mm)139.3 × 88.9 × 45.8 mm

Weather sealingYes

Battery

BatteryBLX-1

Battery life (CIPA)640 shots

Storage

Card slots1

Card typesSD UHS-II, SD UHS-I

Viewfinder

Viewfinder typeOLED EVF

EVF resolution2,360,000 dots

EVF magnification0.78 ×

EVF refresh rate120 Hz

LCD

LCD size3 in

LCD typeVari-angle touchscreen

TouchscreenYes

Connectivity

USBUSB-C

HDMIMicro HDMI

Wi-FiYes

Wi-Fi standardWi-Fi 5 (802.11ac)

BluetoothYes

Microphone jack (3.5mm)Yes

Headphone jack (3.5mm)No

Lens Mount

Lens mountMicro Four Thirds