The Chrosziel 110:85mm Step-Down Ring is a precision-engineered lens accessory designed to adapt lenses with a larger front thread diameter to accept filters with a smaller diameter. Specifically, this ring allows a lens with a 110mm filter thread to utilize filters sized for an 85mm thread. Constructed from high-quality aluminum, it features precise threading on both the male (110mm) and female (85mm) sides to ensure a secure, wobble-free fit without interfering with the optical path. This adapter ring is an essential tool for cinematographers and photographers who own expensive, large-diameter lenses but wish to utilize a collection of smaller, more common (and often more affordable) filters, such as neutral density, polarizing, or special effect filters.

The ring is machined to exacting tolerances to maintain lens and filter alignment, which is critical for avoiding vignetting (darkening of the corners) and ensuring the filter functions correctly. Its slim profile minimizes the addition of extra length to the lens assembly, helping to maintain balance and avoid interference with lens hoods or matte boxes where possible. The use of durable, lightweight aluminum makes it robust enough for professional use while keeping the overall kit weight manageable.

For professionals managing a diverse set of lenses and filters, the Chrosziel 110:85mm Step-Down Ring provides a cost-effective and practical solution to maximize filter utility across different lens systems. It exemplifies a simple yet vital piece of gear that enhances system flexibility, allowing creators to apply their preferred optical effects regardless of the primary lens's front diameter.