SLB-20B-40P 20.0 mm Dia. x 40.7 mm FL; Double-Convex Lens Uncoated

The SLB-20B-40P is a high-quality double-convex lens offered by OptoSigma, a renowned vendor in the optical industry. This lens, with a base shape of a circle, is designed for use in a wide range of optical applications.

The lens features a diameter of 20.0 mm and a center thickness of 4.4 mm, ensuring a substantial light-gathering capacity. The edge thickness is 2.0 mm, providing structural rigidity and resistance to deformation. The effective focal length (EFL) of this lens is 40.7 mm, making it suitable for applications requiring moderate magnification.

The lens is made of n-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. The radii of curvature for the first and second surfaces are 41.52 mm and -41.52 mm, respectively, indicating a symmetrical design that minimizes optical aberrations. The back focal length (BFL) is 39.3 mm, which is crucial for determining the lens's placement in an optical system.

This lens is uncoated, meaning it does not have any anti-reflective coatings. While this may result in higher reflective losses, it also means the lens is less susceptible to damage from environmental factors, making it ideal for applications in harsh environments.

The provided weblink leads to the product page on OptoSigma's official website, where users can find more information and purchase this lens. The link's status indicates that the lens is currently in stock, ensuring quick delivery for urgent projects.