SLB-25.4B-30N 25.4 mm Dia. x -29.7 mm FL; Double-Concave Lens Uncoated

The SLB-25.4B-30N is a high-quality double-concave lens, sourced from the reputable vendor OptoSigma. This lens, with a base shape of a circle, is designed for use in a wide range of optical applications, thanks to its precise geometry and material properties.

The lens has a diameter of 25.4 mm, making it suitable for use in systems with similar aperture sizes. The edge thickness is 7.4 mm, while the center thickness is a slender 2 mm, contributing to its double-concave design. The effective focal length (EFL) of this lens is -29.7 mm, indicating its converging properties.

The lens is made from n-bk7 schott, a popular optical material known for its excellent optical properties. This material is particularly suitable for use in the visible spectrum, with a wavelength of 546.1 nm specified in the item data.

The lens's geometry includes inner and outer radii of 0 mm, with radii of curvature of r1 and r2 at -31.14 mm and 31.14 mm, respectively. These parameters contribute to the lens's double-concave shape and its optical power.

Notably, this lens is uncoated. While coatings can enhance the performance of lenses in certain applications, an uncoated lens can be advantageous in situations where cost, simplicity, or specific optical characteristics are priorities.