L-BCC121 50.8 mm Dia. Double-Concave Lens; EFL=-200mm Uncoated

The L-BCC121 is a 50.8 mm diameter Double-Concave Spherical Lens, sourced from the renowned optical vendor, Ross Optical. This lens is designed for use in systems where a negative focal length is required, with an Effective Focal Length (EFL) of -200mm.

The lens is fabricated from the high-quality material, N-BK7 Schott, a borosilicate crown glass known for its excellent optical properties, including low dispersion and high transmission across a wide spectrum. The lens's geometry features a base shape of a circle, with an edge thickness of 5.03mm and a center thickness of 2.5mm, providing a robust and compact design.

The L-BCC121's double-concave structure is defined by its radii of curvature, R1 and R2, which are -207.5733811mm and 207.5733811mm respectively. These values indicate a symmetrical design, where the lens's curvature is identical on both sides but in the opposite direction. This design is ideal for applications where a dispersive element is needed to spread or concentrate light.

Notably, this lens is uncoated, meaning it does not have any anti-reflective or other surface treatments. While this may result in higher reflectivity at the lens's surfaces, it does not affect the lens's optical performance within its design wavelength of 587.6nm.