
The SLB-25.4B-40P is a high-quality double-convex lens offered by OptoSigma, a renowned vendor in the optical industry. This lens, designed with a base shape of a circle, is fabricated from the material n-bk7 schott, a popular choice due to its excellent optical properties.
The lens boasts a diameter of 25.4 mm and a center thickness of 5.9 mm, providing a substantial surface area for light transmission. The edge thickness is 1.9 mm, contributing to the lens's overall robustness. The effective focal length (EFL) of this lens is 41 mm, making it suitable for a wide range of optical applications.
The SLB-25.4B-40P features a spherical geometry, with radii of curvature R1 and R2 being 41.52 mm and -41.52 mm respectively. This design ensures a smooth and even distribution of light, minimizing aberrations and distortions. The back focal length (BFL) of this lens is 39 mm, which should be considered when designing the optical system.
This lens is uncoated, offering a cost-effective solution for applications where coating is not a necessity. However, for applications requiring higher light transmission or where environmental factors are a concern, coated versions of this lens are available.



