What filter size does the Canon RF 50mm f/1.8 STM take?

The Canon RF 50mm f/1.8 STM takes 43mm screw-in filters — its front filter thread is 43mm. Any standard 43mm UV, polarizer or ND filter screws straight on.

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Affiliate links never affect our specs or which lenses we compare.

Canon RF lenses that share the 43mm thread

Buy one good set of 43mm filters and it also fits:

• Canon RF 16mm f/2.8 STM — 16mm f/2.8

Screw-in filters are mount-agnostic — 2 verified lenses on other mounts also take 43mm: see every 43mm lens.

A step-up ring also lets a 43mm lens use one size-larger filters, which is how many photographers standardize a single filter set across lenses.

All 43mm lenses: the 43mm hub · every covered lens: filter sizes index · this lens on Amazon: Canon RF 50mm f/1.8 STM

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.