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OM System OM-3 Astro

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Mirrorless camera

A mirrorless camera by OM System with a 20.4-megapixel Micro Four Thirds sensor, announced in 2026. An OM-3 with an IR-cut filter that passes H-alpha light, made for astrophotography; it is not meant for everyday colour photos.

MakerOM System
MountMicro Four Thirds
SensorMicro Four Thirds, 17.3 x 13mm, crop factor 2.0
Resolution20.4 megapixels
Stabilisationin the body
Announced2026
Typemirrorless camera

Sensor size

Micro Four Thirds17.3 × 13 mmFull frame36 × 24 mmCrop factor 2×
Micro Four Thirds (17.3 x 13 mm) against full frame.

Focal lengths on it

Lenses frame like 2.0 times their focal length on full frame: 12mm like 24mm, 18mm like 35mm, 25mm like 50mm, 42mm like 85mm. Use the focal length converter for any other.

Lenses for it

Adapting lenses

Its short flange takes almost any old manual lens through a cheap adapter, at twice the focal length in full-frame terms.

Questions people ask

Lenses for what you shoot

Compare with

See what it frames: its view at any distance and focal length, and its depth of field, drawn to scale.