SLB-25B-60NM 25.0 mm Dia. x -59.7 mm FL; Coated; Double-Concave Lens 400-700nm

The SLB-25B-60NM is a high-quality double-concave lens, designed and manufactured by OptoSigma. This lens, with a base shape of a circle, is specifically engineered for use within the wavelength range of 400-700nm, making it suitable for a wide range of optical applications.

The lens has a diameter of 25.0mm and a center thickness of 2.0mm, ensuring a compact and efficient design. The edge thickness is 4.5mm, providing robustness and durability. The effective focal length (EFL) of this lens is -59.7mm, and the back focal length (BFL) is -60.3mm, indicating a strong converging capability.

The lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties and chemical durability. The lens surface is coated with Opt M, a broadband anti-reflection coating that enhances transmission and reduces surface reflections, thereby improving overall system performance.

This lens is a spherical lens, which means it has a curved surface with a constant radius of curvature. The first radius of curvature (R1) is -62.28mm, and the second radius of curvature (R2) is 62.28mm, indicating the double-concave nature of the lens.