63-709 10 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=40mm VIS 0° 425-675nm

The 63-709 is a high-quality achromatic doublet lens, available from Edmund Optics, with a diameter of 10 mm and a focal length of 40 mm. This lens is specifically designed for use within the visible light spectrum, spanning from 425 to 675 nm.

The lens is constructed from two types of glass: N-BK7 and N-SF5, both from Schott. N-BK7, a borosilicate crown glass, is known for its excellent optical transmission and low dispersion, making it a popular choice for many optical applications. N-SF5, a dense flint glass, offers high refractive index and Abbe number, which aids in reducing chromatic aberration.

The lens features a front and back coating of EDM VIS-0 STD curve, which is a broadband anti-reflection coating designed for use within the visible spectrum. This coating enhances the lens's performance by reducing surface reflections, thereby increasing transmission and improving image quality.

The geometry of the lens includes a thickness of 3.74 mm at the edge, a center thickness of 3 mm, and a center thickness 'a' of 1.5 mm. The lens's inner and outer radii are 0, and it has a shape classified as a multiplet.

This lens is a versatile and high-performing option for a variety of optical systems, particularly those operating within the visible light spectrum. With its high-quality materials and precise construction, the 63-709 is a reliable choice for a wide range of applications.