SLB-25.4B-50NIR2 25.4 mm Dia. x -49.7 mm FL; Coated; Double-Concave Lens 750-1550nm

The SLB-25.4B-50NIR2 is a high-quality double-concave lens, designed with a base shape of a circle and a diameter of 25.4 mm. This lens is sourced from OptoSigma, a renowned vendor known for its precision optical components. The lens is constructed from n-bk7 schott material, a popular choice for its excellent optical properties.

The lens features a significant double-concave geometry, with a center thickness of 2 mm and an edge thickness of 5.2 mm. The effective focal length (EFL) is -49.7 mm, indicating a strong converging effect. The radii of curvature for the first and second surfaces are -51.9 mm and 51.9 mm, respectively, contributing to the lens's double-concave structure. The back focal length (BFL) is -50.4 mm.

This lens is specifically designed for use in the wavelength range of 546.1 nm. It comes with a coating of opt ir2 on both the front and back surfaces, enhancing its performance in the infrared spectrum, particularly between 750 nm and 1550 nm.