Urth 86-40.5mm Adapter Ring for 100mm Square Filter Holder

Adapter ring for 100mm square filter holder

The Urth 86-40.5mm adapter ring lets photographers attach a 100mm square filter holder to lenses with a 40.5mm thread. It bridges the size gap between the small front thread and the larger filter system, so a single holder can be used across multiple lenses. The accessory is aimed at landscape and long-exposure shooters who rely on square filters for graduated or neutral density effects.

Fits 40.5mm threads and 100mm holders

The ring screws onto any 40.5mm lens thread and presents an 86mm outer interface that matches standard 100mm square filter holders. Its true-thread design ensures secure mounting without cross-threading, while the lightweight alloy construction adds minimal bulk to the front of the lens. No step-up rings or additional adapters are required when the lens already has a 40.5mm thread.

Matte finish reduces reflections under sustained use

The matte black coating suppresses flare and ghosting that can appear during long exposures or when shooting into bright light. Durable alloy threads resist wear from repeated mounting and removal, maintaining a tight seal against the holder. The ring remains stable in cold or humid conditions, so filter alignment does not shift during extended sessions.