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Olympus OM-D E-M1 Mark III vs OM System OM-1

The Olympus OM-D E-M1 Mark III and the OM System OM-1 side by side, computed from this guide's catalogue.

Which to pick

Pick the OM System OM-1 if you want a newer model (2022 against 2020), which usually means better autofocus and video. On these specs the Olympus OM-D E-M1 Mark III has no clear advantage: choose it if the price, the handling or a lens you own decides it.

Still torn? Ask the guide about the Olympus OM-D E-M1 Mark III and the OM System OM-1

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Olympus OM-D E-M1 Mark III	OM System OM-1
Maker	Olympus	OM System
Mount	Micro Four Thirds	Micro Four Thirds
Sensor	Micro Four Thirds, 17.3 x 13 mm	Micro Four Thirds, 17.3 x 13 mm
Crop factor	2×	2×
Resolution	20.4 MP	20.4 MP
Stabilisation	in the body	in the body
Announced	2020	2022
Type	mirrorless camera	mirrorless camera
Weight	580 g	599 g
Lenses in this guide	125 for its sensor	125 for its sensor

Sensor size

Both sensors drawn to the same scale.

Crop factors: Olympus OM-D E-M1 Mark III 2×, OM System OM-1 2×.

What a 50mm frames like

Both have the same sensor size, so a 50mm lens frames the same on each: like 100mm on full frame.

Horizontal angle of view on each.

Lenses

Both take Micro Four Thirds lenses, so a lens bought for one works on the other: 125 lenses in this guide cover both sensors.

The Olympus OM-D E-M1 Mark III: 125 Micro Four Thirds lenses in this guide cover its sensor. The OM System OM-1: 125 Micro Four Thirds lenses in this guide cover its sensor.