SLB-25B-100N 25.0 mm Dia. x -99.7 mm FL; Double-Concave Lens Uncoated

The SLB-25B-100N is a high-quality double-concave lens, sourced from the reputable optical 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 25.0 mm and a thickness at the edge of 3.5 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 -99.7 mm, indicating its concave nature. The first radius of curvature (R1) is -103.8 mm, while the second radius of curvature (R2) is 103.8 mm, both of which contribute to the lens's double-concave shape.

The back focal length (BFL) of this lens is -100.3 mm. Notably, the inner and outer radii are both 0, indicating that this lens does not have any special curvature or treatment on its edges.

The lens is made of n-bk7 schott material, a common and reliable material in the optical industry. It is designed to work with a wavelength of 546.1 nm. The lens does not come with any coating, offering users the flexibility to apply the coating that best suits their specific application.