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.

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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 — 22 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

Canon RF-S 18-45mm f/4.5-6.3 IS STM

Fits

Canon EOS R7, Canon EOS R50, Canon EOS R50 V and 2 more Canon RF cameras

Type

everyday zoom 18-45mm

Max aperture

f/4.5-6.3

Weight

130 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.