49-958 20 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=80mm VIS-NIR 400-1000nm

The 49-958 is a high-quality achromatic doublet lens, designed and manufactured by Edmund Optics. This lens, with a 20 mm diameter, is specifically engineered for use in the visible to near-infrared spectrum, spanning from 400 to 1000 nanometers. The lens is part of Edmund Optics' extensive catalog, and it is currently in stock, as indicated by its weblink status.

The lens features a focal length of 80 mm, indicated by its Effective Focal Length (EFL). This makes it suitable for applications that require a longer focal length, such as telephoto lenses in cameras or microscopy objectives. The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring high optical quality and performance.

The geometry of the lens is carefully designed, with a thickness of 4.51 mm at the edge and 4 mm at the center. The lens also features a central thickness of 2 mm, providing structural integrity while minimizing unnecessary weight. The lens's inner and outer radii are 0, indicating a symmetrical design, which can help to reduce optical aberrations.

The lens is coated with Edmund Optics' VIS-NIR coating, specifically the EDMM VISNIR0SP2002000 coating, on both the front and back surfaces. This coating is designed to optimize the lens's performance in the visible to near-infrared spectrum, reducing reflection and increasing transmission.