You asked

Om system om 3 vs om system pen?

Here is what the site says about that.

From OM System OM-3: OM System OM-3: A mirrorless camera by OM System with a 20.4-megapixel Micro Four Thirds sensor, announced in 2025. Specs - Maker: OM System - Mount: Micro Four Thirds - Sensor: Micro Four Thirds, 17.3 x 13mm, crop factor 2.0 - Resolution: 20.4 megapixels - Stabilisation: in the body - Announced: 2025 - Type: mirrorless camera Focal lengths on it Lenses frame like 2.0 times their focal length on full frame: 12mm like ...

From OM System PEN: OM System PEN: A mirrorless camera by OM System with a 20.4-megapixel Micro Four Thirds sensor, announced in 2026. A rangefinder-style PEN with a built-in electronic viewfinder, IPX1 splash resistance and five-axis stabilisation. Specs - Maker: OM System - Mount: Micro Four Thirds - Sensor: Micro Four Thirds, 17.3 x 13mm, crop factor 2.0 - Resolution: 20.4 megapixels - Stabilisation: in the body - Announced: 2026 - Type: mirrorless camera Focal lengths on ...

Quoted from this site's pages.

From these pages