Urth 86-49mm Adapter Ring for 100mm Square Filter Holder

Universal 100 mm Filter Compatibility

The Urth 86-49 mm adapter ring connects a 49 mm lens thread to any standard 100 mm square filter holder. Photographers who already own a 100 mm system can now use it on smaller-diameter glass without buying a new holder. The part is built from a lightweight alloy that resists wear during frequent field changes. Its matte black anti-reflective finish cuts glare that would otherwise reduce contrast.

True Threads and Lightweight Alloy Build

Precision-cut threads engage smoothly and lock securely, so the holder will not loosen when you rotate a graduated filter. The alloy construction keeps weight low while withstanding repeated mounting and temperature swings. A universal bayonet fits most 100 mm holders regardless of brand, removing the need for proprietary adapters. The low-profile ring sits close to the front element, minimising vignetting on wide angles.

Upgrade Path for 49 mm Lens Owners

This adapter replaces step-up rings that only accept circular filters, letting you slide square ND, GND or polarising panels instead. The jump is worth it when you need the flexibility of a square system — sliding horizons or stacking densities — on a lens that lacks a native 100 mm thread. Buyers who want a dedicated circular filter workflow or who shoot exclusively with larger thread sizes will not benefit from this ring.