What filter size does the Canon RF 28mm f/2.8 STM take?

The Canon RF 28mm f/2.8 STM takes 55mm screw-in filters — its front filter thread is 55mm. Any standard 55mm UV, polarizer or ND filter screws straight on.

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Canon RF lenses that share the 55mm thread

Buy one good set of 55mm filters and it also fits:

• Canon RF-S 18-150mm f/3.5-6.3 IS STM — 18-150mm f/3.5-6.3
• Canon RF-S 55-210mm f/5-7.1 IS STM — 55-210mm f/5-7.1

Screw-in filters are mount-agnostic — 23 verified lenses on other mounts also take 55mm: see every 55mm lens.

A step-up ring also lets a 55mm lens use one size-larger filters, which is how many photographers standardize a single filter set across lenses.

All 55mm lenses: the 55mm hub · every covered lens: filter sizes index · this lens on Amazon: Canon RF 28mm f/2.8 STM

Canon RF 28mm f/2.8 STM

Fits

Canon EOS R6 Mark II, Canon EOS R7, Canon EOS R50 and 13 more Canon RF cameras

Type

everyday prime 28mm

Max aperture

f/2.8

Weight

120 g

Weather-sealed

No

See price on Amazon

Thread sizes verified 2026-09-03 against per-mount lens specification tables and, where no such table exists (L-mount), the manufacturers’ own published specification pages, 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.