47-675 12.5 mm Dia. N-BASF64/N-BK7/N-BASF64 Steinheil Achromatic Triplet; EFL=25mm MgF2 400-700nm

This is a 12.5 mm diameter Steinheil Achromatic Triplet lens, offered by the renowned optical components vendor, Edmund Optics. The lens is cataloged under the number 47-675 and is available for purchase on their official website. The product listing is currently valid and indicates that the lens is in stock.

The lens is a triplet, meaning it is composed of three individual lenses made from different materials. The materials used in this lens are N-BASF64 from Schott, N-BK7 from Schott, and again N-BASF64 from Schott. This specific combination of materials is often used in optical systems due to their excellent optical properties and ability to minimize chromatic aberration.

The lens has an effective focal length (EFL) of 25mm, making it suitable for a wide range of optical applications. The geometry of the lens includes a thickness of 15.39mm at the edge, a central thickness of 4mm, and a thickness of 10mm at the center-a and center-b positions. The lens's inner and outer radii are not specified, indicating that they are likely not critical to the lens's performance in its intended application.

The lens features a coating of MgF2 on both the front and back surfaces. This coating is standard for Edmund Optics and provides a wide spectral range transmission from 400 to 700nm. The coating is designed to enhance the lens's performance by reducing reflection and increasing transmission, thereby improving the overall efficiency and quality of the optical system in which it is used.