What filter size does the om system m zuiko 90mm f 3 5 macro is pro take?

Here is what the site says about that.

From OM System M.Zuiko 90mm f/3.5 Macro IS PRO: OM System M.Zuiko 90mm f/3.5 Macro IS PRO: A macro lens by OM System for Micro Four Thirds cameras, 90mm f/3.5. A weather-sealed, stabilised macro lens that reaches 2x magnification. Specs - Maker: OM System - Focal length: 90mm (macro) - Maximum aperture: f/3.5 - Made for: Micro Four Thirds sensors - Mounts: Micro Four Thirds - Stabilised: yes - Autofocus: yes What it frames like - On Micro Four Thirds (Micro Four Thirds): like 180mm on full ...

From Sensor sizes: The main sizes: - Full frame (36 x 24mm, the size of a 35mm film frame). The reference size: when people quote a focal length "in full-frame terms", this is what they mean. - APS-C (about 23 x 15mm). Crop factor about 1.5x (1.6x on Canon). Most entry and mid-range mirrorless cameras. - Micro Four Thirds (about 17 x 13mm). Crop factor 2x. Small, light systems from OM System and Panasonic. - 1-inch ...

Quoted from this site's pages.