Urth 86-37mm Adapter Ring for 100mm Square Filter Holder

Adapter ring for 100 mm square filter system

This 86-37 mm adapter ring connects lenses with a 37 mm front thread to a 100 mm square filter holder. It is built for photographers who want to use the same holder across multiple lenses without buying a separate holder for each thread size. The lightweight alloy construction keeps the overall kit light while the matte black finish reduces unwanted reflections. True threads ensure a secure, repeatable fit every time.

Check your lens thread before ordering

Verify that the lens you plan to use has a 37 mm filter thread; the ring will not fit any other diameter. Confirm that your square filter holder accepts 100 mm filters, as this adapter is designed specifically for that format. Ensure there is enough clearance between the lens barrel and the holder once the ring is mounted, especially on wide-angle lenses where vignetting can occur. The ring adds minimal height, but physical space varies by lens design.

Upgrade from single-thread holders

Photographers moving from a fixed-thread holder to a modular 100 mm system gain the ability to swap this ring for other sizes instead of replacing the entire holder. The jump is worth it when you shoot with several lenses that have different thread diameters and want one consistent filter workflow. It is not suited for shooters who only ever use a single lens diameter or who need a circular screw-in filter rather than a square drop-in system.