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.

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

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.