SLB-50.8B-60N 50.8 mm Dia. x -59.5 mm FL; Double-Concave Lens Uncoated

The SLB-50.8B-60N is a high-quality double-concave lens offered by OptoSigma, a leading vendor in the optical industry. This lens, designed for use in a wide range of optical systems, boasts a diameter of 50.8 mm and a back focal length of -59.5 mm, making it suitable for applications requiring a negative lens with a substantial aperture.

The lens is fabricated from n-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. The base shape of the lens is circular, and it features a double-concave geometry with radii of curvature of -62.28 mm and 62.28 mm for the first and second surfaces, respectively. This geometry results in a center thickness of 3 mm and an edge thickness of 13.8 mm, providing robustness and rigidity to the lens.

The lens is uncoated, meaning it does not have any anti-reflective or other surface coatings. While coatings can enhance performance in specific applications, an uncoated lens can be advantageous in situations where cost-effectiveness, simplicity, or specific spectral requirements are priorities.