What filter size does the Canon RF-S 18-45mm f/4.5-6.3 IS STM take?

The Canon RF-S 18-45mm f/4.5-6.3 IS STM takes 49mm screw-in filters — its front filter thread is 49mm. Any standard 49mm 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 49mm thread

Buy one good set of 49mm filters and it also fits:

• Canon RF-S 10-18mm f/4.5-6.3 IS STM — 10-18mm f/4.5-6.3

Screw-in filters are mount-agnostic — 4 verified lenses on other mounts also take 49mm: see every 49mm lens.

A step-up ring also lets a 49mm lens use one size-larger filters, which is how many photographers standardize a single filter set across lenses.

All 49mm lenses: the 49mm hub · every covered lens: filter sizes index · this lens on Amazon: Canon RF-S 18-45mm f/4.5-6.3 IS 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.