What filter size does the Canon RF 28-70mm f/2 L USM take?

The Canon RF 28-70mm f/2 L USM takes 95mm screw-in filters — its front filter thread is 95mm. Any standard 95mm UV, polarizer or ND filter screws straight on.

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Canon RF lenses that share the 95mm thread

Buy one good set of 95mm filters and it also fits:

• Canon RF 200-800mm f/6.3-9 IS USM — 200-800mm f/6.3-9
• Canon RF 800mm f/11 IS STM — 800mm f/11

Screw-in filters are mount-agnostic — 1 verified lens on other mounts also takes 95mm: see every 95mm lens.

A step-up ring also lets a 95mm lens use one size-larger filters, which is how many photographers standardize a single filter set across lenses.

All 95mm lenses: the 95mm hub · every covered lens: filter sizes index · this lens on Amazon: Canon RF 28-70mm f/2 L USM

Thread sizes verified 2026-08-28 against community-maintained per-mount lens specification tables (compiled from the manufacturers' own spec sheets), matched brand-strictly to our lens index. Lenses whose thread we could not uniquely verify are left out rather than guessed — coverage grows as verified data lands.