SLB-25.4B-70P 25.4 mm Dia. x 70.7 mm FL; Double-Convex Lens Uncoated

The SLB-25.4B-70P is a high-quality double-convex lens offered by OptoSigma, a renowned vendor in the optical industry. This lens, designed for use in various optical systems, features a base shape of a circle and is constructed from n-bk7 schott material, a common and reliable option in the field.

The lens has a diameter of 25.4 mm and a thickness at the edge of 1.9 mm, ensuring durability and stability. The center thickness is 4.1 mm, which contributes to the lens' overall optical performance. The effective focal length (EFL) of this lens is 70.7 mm, making it suitable for applications that require a longer focal length.

The first radius of curvature (R1) is 72.66 mm, and the second radius of curvature (R2) is -72.66 mm, indicating the double-convex nature of the lens. The back focal length (BFL) is 69.3 mm, which is an important consideration when integrating this lens into an optical system.

This lens is uncoated, meaning it does not have any anti-reflective coatings. While this may result in a higher reflectance loss, it also means the lens is more cost-effective and versatile, as it can be used in a wide range of wavelengths without the risk of coating damage.