SLB-25.4B-40N 25.4 mm Dia. x -39.7 mm FL; Double-Concave Lens Uncoated

The SLB-25.4B-40N is a high-quality double-concave lens, 25.4 mm in diameter, manufactured by OptoSigma. This lens is made from the renowned material n-BK7 Schott, a borosilicate crown glass known for its excellent optical properties, including low dispersion and high transmission in the visible spectrum.

The lens features a base shape of a circle and is designed with a concave-concave geometry. The first radius of curvature (R1) is -41.52 mm, while the second radius of curvature (R2) is 41.52 mm, indicating a symmetrical design. The center thickness of the lens is 2 mm, while the edge thickness is 6 mm, providing a robust structure.

The effective focal length (EFL) of this lens is -39.7 mm, making it suitable for applications that require a diverging lens. The back focal length (BFL) is -40.4 mm, and the inner and outer radii are 0 mm, indicating a uniform curvature throughout the lens.

This lens is uncoated, meaning it does not have any additional layers to enhance its optical properties. However, it is still highly transmissive in the visible spectrum, with a wavelength of 546.1 nm.

The SLB-25.4B-40N is currently in stock and available for immediate purchase. For more information, please refer to the vendor's website provided in the weblinks section.