SLB-50B-50N 50.0 mm Dia. x -49.5 mm FL; Double-Concave Lens Uncoated

The SLB-50B-50N is a high-quality double-concave lens, sourced from the reputable vendor OptoSigma. This lens is designed with a base shape of a circle and features a spherical geometry, making it suitable for a wide range of optical applications.

The lens has a diameter of 50.0 mm and a center thickness of 3.0 mm, ensuring a substantial light-gathering capacity. The edge thickness is 15.8 mm, providing robustness and durability. The effective focal length (EFL) of this lens is -49.5 mm, indicating its double-concave nature, which is further emphasized by its radii of curvature, R1 and R2, which are -51.9 mm and 51.9 mm respectively. The back focal length (BFL) is -50.5 mm.

This lens is made from the renowned material n-BK7 Schott, a borosilicate crown glass known for its excellent optical properties, including a high refractive index and low dispersion. The lens is uncoated, offering users the flexibility to apply their preferred coating based on their specific application requirements.

The lens is designed to operate at a wavelength of 546.1 nm, making it suitable for applications that use visible light. The item data does not specify any additional coatings, leading us to assume that the lens is uncoated, offering a clear, unaltered optical path.