SLB-25B-30NM 25.0 mm Dia. x -29.7 mm FL; Coated; Double-Concave Lens 400-700nm

The SLB-25B-30NM 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 boasts a diameter of 25.0 mm and a center thickness of 2.0 mm, ensuring a compact and efficient design. The edge thickness is 7.2 mm, providing robustness and durability. The effective focal length (EFL) of this lens is -29.7 mm, and the back focal length (BFL) is -30.3 mm, indicating a strong converging capability.

The lens is made from n-BK7 Schott, a renowned optical glass known for its excellent optical properties and chemical durability. The double-concave geometry, with radii of curvature R1 (-31.14 mm) and R2 (31.14 mm), further enhances the lens's optical performance.

The SLB-25B-30NM comes with a coating on both the front and back surfaces. The coating is OptoSigma's proprietary Opt M coating, designed to enhance the lens's performance by reducing surface reflections and improving transmission.