SLB-25.4B-70NIR2 25.4 mm Dia. x -69.7 mm FL; Coated; Double-Concave Lens 750-1550nm

OptoSigma's SLB-25.4B-70NIR2 is a high-quality double-concave lens, designed with a base shape of a circle and a spherical geometry. This lens has a diameter of 25.4 mm and a center thickness of 2 mm, with an edge thickness of 4.2 mm. The effective focal length (EFL) of this lens is -69.7 mm, making it a powerful tool for various optical applications.

The lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. The double-concave design, with radii of curvature of -72.66 mm for the first surface and 72.66 mm for the second, contributes to its unique optical characteristics. The back focal length (BFL) is -70.4 mm, and the lens has no inner or outer radius.

This lens is designed to operate within the wavelength range of 546.1 nm, making it suitable for a wide range of applications. The lens comes with a coating of opt IR2 on both the front and back surfaces, enhancing its performance in the infrared spectrum, specifically between 750 nm and 1550 nm.