89-682 40 mm Dia. N-SK11/N-SF5 Achromatic Doublet; EFL=50mm VIS 0° 425-675nm

The 89-682 is a high-quality achromatic doublet lens, boasting a 40 mm diameter and an effective focal length (EFL) of 50 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase through their official website.

The lens is constructed from two types of Schott glass, N-SK11 and N-SF5, which are carefully selected to minimize chromatic aberration, a common issue in lens systems. The front and back surfaces of the lens are coated with the EDM VIS-0 standard curve coating, enhancing its light transmission capabilities and overall performance.

The lens geometry is meticulously designed, with an inner radius of 0 mm, an outer radius of 0 mm, and a center thickness of 19 mm. The edge thickness measures 16.52 mm, while the central thickness of the first surface (r1) is 28.56 mm and that of the second surface (r2) is -29.96 mm. The third surface (r3) has a radius of -153.67 mm.

This lens is a multiplet, meaning it is composed of multiple elements, and is circular in shape. It is available in stock, as indicated by its valid web link status. The 89-682 is an excellent choice for various applications that require a high-performing achromatic doublet lens within the specified visible light spectrum.