L-BCC026 12.5 mm Dia. Double-Concave Lens; EFL=-250mm Uncoated

The L-BCC026 is a 12.5 mm diameter Double-Concave Spherical Lens, sourced from the renowned optical component vendor, Ross Optical. This lens is designed for use in systems where a negative focal length is required.

The lens features an Effective Focal Length (EFL) of -250mm, indicating its double-concave nature. The EFL is a critical parameter in lens selection, as it directly influences the convergence or divergence of light rays passing through the lens. A negative EFL, as in this case, implies that the lens will diverge light rays, making it suitable for applications such as beam expansion or divergence.

The lens has a central thickness of 1.5mm and an edge thickness of 1.7mm. This thickness profile is crucial in determining the lens's overall robustness and ability to withstand handling and installation stresses. The lens is made from N-BK7 Schott, a popular optical glass known for its excellent optical properties and durability.

The lens's geometry includes an inner radius of 0mm and an outer radius of 0mm, indicating a symmetrical double-concave design. The radii of curvature (R1 and R2) are -258.6892858mm and 258.6892858mm, respectively, further confirming the double-concave nature of the lens.

Notably, this lens is uncoated. Coatings are often applied to lenses to enhance their optical performance by reducing surface reflections, increasing transmission, or providing specific wavelength-dependent properties. However, in this case, the lens is intended for use in its bare form, which may be suitable for certain applications where coating-induced artifacts need to be avoided.