SLB-10B-20NM 10.0 mm Dia. x -19.7 mm FL; Coated; Double-Concave Lens 400-700nm

The SLB-10B-20NM 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 10.0 mm and a center thickness of 2.0 mm, ensuring a compact and efficient design. The edge thickness is 3.2 mm, providing robustness and durability. The effective focal length (EFL) of this lens is -19.7 mm, and the back focal length (BFL) is -20.3 mm, indicating a strong converging power.

The lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties and chemical resistance. The double-concave geometry of the lens is defined by radii of curvature of -20.76 mm on the first surface and 20.76 mm on the second surface.

The lens is coated with Opt M on both the front and back surfaces, enhancing its performance in the specified wavelength range. This coating improves the transmission of light and reduces reflection, thereby increasing the efficiency of the optical system in which it is used.