SLB-20B-20N 20.0 mm Dia. x -19.7 mm FL; Double-Concave Lens Uncoated

The SLB-20B-20N is a high-quality double-concave lens, uncoated, with a diameter of 20.0 mm and a focal length of -19.7 mm. This lens is sourced from OptoSigma, a renowned vendor known for their precision optical components.

The lens is made from n-BK7 Schott, a popular material in the optical industry due to its excellent optical properties. The base shape of the lens is circular, and it features a spherical geometry with a center thickness of 2.0 mm and an edge thickness of 7.1 mm. The inner and outer radii are both 0 mm, indicating a uniform curvature.

The lens has a back focal length of -20.3 mm and an effective focal length of -19.7 mm. The radii of curvature for the first and second surfaces are -20.76 mm and 20.76 mm, respectively. These specifications make the lens suitable for a wide range of optical applications.

The lens is uncoated, which means it does not have any anti-reflective or other surface coatings. This may be suitable for applications where such coatings are not required or desirable. However, users should be aware that uncoated lenses can exhibit higher levels of reflection, which may affect the performance in certain applications.

The lens is currently in stock and can be purchased directly from the vendor's website. The provided weblink leads directly to the product page for easy access and purchase.