What filter size does the Viltrox AF 40mm f/2.5 take?

The Viltrox AF 40mm f/2.5 takes 55mm screw-in filters — its front filter thread is 55mm. Any standard 55mm UV, polarizer or ND filter screws straight on.

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Nikon Z lenses that share the 55mm thread

Buy one good set of 55mm filters and it also fits:

• Viltrox AF 24mm f/1.8 — 24mm f/1.8
• Viltrox AF 28mm f/1.8 — 28mm f/1.8

Screw-in filters are mount-agnostic — 7 verified lenses on other mounts also take 55mm: see every 55mm lens.

A step-up ring also lets a 55mm lens use one size-larger filters, which is how many photographers standardize a single filter set across lenses.

All 55mm lenses: the 55mm hub · every covered lens: filter sizes index · this lens on Amazon: Viltrox AF 40mm f/2.5

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.