LB11-25-50 25.4 mm Dia. N-BK7 Double-Concave Lens; EFL=-50mm Uncoated

The LB11-25-50 is a high-quality double-concave lens offered by CeNing Optics, a renowned vendor in the optical industry. This lens, with a diameter of 25.4 mm, is designed for use in a variety of optical systems that require concave-concave geometry.

The lens's base shape is circular, and it features a center thickness of 2 mm. The effective focal length (EFL) is -50 mm, indicating that it is a diverging lens, which spreads out light rays that pass through it. This makes it suitable for applications such as beam expansion, image reduction, or in systems where a virtual image is required.

The lens is made from N-BK7, a popular optical glass from Schott, known for its excellent optical properties and wide transmission range. The radii of curvature for the first and second surfaces are -52.17 mm and 52.17 mm, respectively. The lens does not have any coating, as indicated in the item data, which means it is uncoated. However, users can request custom coatings based on their specific requirements.

The wavelength for this lens is 546.1 nm, which is in the visible light spectrum. This lens is spherical in shape, a common choice for its ease of manufacturing and good optical performance.