SLB-25.4B-50N 25.4 mm Dia. x -49.7 mm FL; Double-Concave Lens Uncoated

The SLB-25.4B-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 25.4 mm and a thickness at the edge of 5.2 mm, ensuring durability and stability. The center thickness is 2 mm, contributing to its overall compact design. The effective focal length (EFL) of this lens is -49.7 mm, indicating its concave nature. The first radius of curvature (R1) is -51.9 mm, while the second radius (R2) is 51.9 mm, which are crucial specifications for understanding its optical performance.

The back focal length (BFL) of this lens is -50.4 mm. Notably, the inner and outer radii are both 0, suggesting a simple and straightforward optical design. This lens is made of n-bk7 schott material, a common choice for its excellent optical properties and versatility.

The wavelength for this lens is 546.1 nm. It's important to note that this lens is uncoated, which may affect its performance in certain applications. However, its uncoated status also means it can be easily customized with a coating to suit specific needs.