What filter size does the Canon RF 100-300mm f/2.8 L IS USM take?

The Canon RF 100-300mm f/2.8 L IS USM takes 112mm screw-in filters — its front filter thread is 112mm. Any standard 112mm UV, polarizer or ND filter screws straight on.

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Canon RF lenses that share the 112mm thread

Among the Canon RF lenses we have verified so far, this is the only one on 112mm.

Screw-in filters are mount-agnostic — 1 verified lens on other mounts also takes 112mm: see every 112mm lens.

A step-up ring also lets a 112mm lens use one size-larger filters, which is how many photographers standardize a single filter set across lenses.

All 112mm lenses: the 112mm hub · every covered lens: filter sizes index · this lens on Amazon: Canon RF 100-300mm f/2.8 L IS USM

Canon RF 100-300mm f/2.8 L IS USM

Fits

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

Type

telephoto zoom 100-300mm

Max aperture

f/2.8

Weight

2650 g

Weather-sealed

Yes

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.