OM System OM-1 Mark II review

OM System OM-1 Mark II is built for outdoor and wildlife shooting where size, sealing and speed matter more than sensor size. Its 20.4MP 4/3-inch stacked BSI Live MOS sensor supports Pro Capture, which buffers frames at 120 fps once the shutter is half pressed, and blackout-free shooting at 50 fps with continuous AF. OM System says the RAW buffer more than doubled from 92 to 213 frames at 120 fps compared with the original OM-1. AI Subject Detection now covers humans as well as birds, pets, cars, aircraft and trains. Stabilization is rated at 8.5 EV stops, and computational features include LiveND from ND2 to ND128, LiveGND and High Res Shot up to 80MP. The magnesium alloy body has IP53 weathersealing and a shutter rated for 400,000 shots. OM System USA listed it from $1,999.99 when we checked. The limit is the smaller sensor, which gives less background blur than full frame. We compared documented features and published prices; we did not test the camera ourselves.

Who it is for

wildlife and outdoor hobbyists who want a light, sealed kit

Price

From $1,999.99 at OM System USA.

FAQ From $1,999.99
Quoted from the vendor pricing page on November 13, 2026.

Key features

• 20.4MP 4/3-inch stacked BSI Live MOS sensor
• 8.5 EV stops of image stabilization
• Pro Capture at 120 fps in RAW with S-AF and 50 fps with C-AF
• AI Subject Detection AF for birds, humans, pets, cars, aircraft and trains
• Built-in LiveND from ND2 to ND128 and LiveGND

Strengths and weaknesses

• Strength: IP53 certified weathersealing on a magnesium alloy body
• Strength: Buffer of 213 RAW frames at 120 fps
• Strength: High Res Shot up to 80MP in 14-bit RAW
• Weakness: The 4/3-inch sensor is smaller than the APS-C and full-frame sensors on this list
• Weakness: 20.4MP effective resolution is the lowest here
• Weakness: At $1,999.99 it costs as much as the full-frame Nikon Z6III

Key facts

• Price checked: From $1,999.99
• Sensor: 20.4MP 4/3-inch stacked BSI Live MOS
• Video: 4K up to 60p
• Stabilization: 8.5 EV stops
• Lens mount: Micro Four Thirds

Where it ranks

OM System OM-1 Mark II is No. 8 in our Best Mirrorless Cameras verdict.