The Chrosziel C-410-66 is a specialized rubber bellows ring designed to create a light-tight seal between a matte box and a camera lens. Specifically engineered for lenses with a 110mm outer diameter, this adapter ring is compatible with Chrosziel’s 411 and 415 series matte boxes. Its primary function is to prevent stray light from leaking behind the filter stages and hitting the lens element, which would otherwise cause unwanted flares, ghosting, or a reduction in overall image contrast. The flexible, accordion-style design allows the lens to move slightly or rotate during focusing without breaking the seal, ensuring consistent performance in dynamic shooting environments.

Constructed from high-quality, durable rubber, the C-410-66 is built to withstand the rigors of professional field use while remaining soft enough to avoid scratching or damaging the lens barrel. It features a secure fit that snaps into the rear of the matte box, providing a stable foundation for filmmakers using larger cinema lenses. By effectively bridging the gap between the matte box's 130mm or 114mm rear opening and a 110mm lens, this ring simplifies lens swaps and ensures that the optical path remains protected from dust, debris, and peripheral light.