63-767 40 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-150mm MgF2 400-700nm

The 63-767 is a high-quality negative achromatic doublet lens, sourced from the renowned optical components manufacturer, Edmund Optics. This lens is designed with a base shape of 40 mm diameter and a focal length of -150mm, making it ideal for a wide range of optical applications.

The lens is constructed from two types of materials, N-BK7 and N-SF5, both from Schott. N-BK7, also known as BK7, is a borosilicate crown glass, widely used in various optical systems due to its excellent optical properties and relatively low cost. N-SF5, on the other hand, is a high-index, low-dispersion glass, often used in high-performance optical systems. The combination of these two materials in a doublet configuration helps to correct chromatic aberrations, ensuring high-quality imaging.

The lens features a standard MgF2 coating on both the front and back surfaces. This coating is designed to reduce reflection and increase transmission in the spectral range of 400-700nm, making it suitable for use in a wide range of visible light applications.

The geometry of the lens includes a thickness of 13.54mm at the edge, a center thickness of 4mm, and a center thickness 'a' of 6.5mm. The lens also features inner and outer radii of 0mm, and radii 'r1' and 'r2' of -91.23mm and 69.66mm respectively, and 'r3' of 211.28mm.