49-327 12.5 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=45mm VIS-NIR 400-1000nm

The 49-327 is a high-quality achromatic doublet lens from Edmund Optics, designed for use in the visible (VIS) and near-infrared (NIR) spectrum, specifically between 400-1000nm. This lens is characterized by its 12.5 mm diameter and an effective focal length (EFL) of 45mm, making it suitable for a wide range of optical applications.

The lens is composed of two elements: N-BK7 from Schott and N-SF5 from Schott. N-BK7, a borosilicate crown glass, is known for its excellent optical properties, including a high Abbe number and low dispersion, making it ideal for achromatic designs. N-SF5, a fluorite crown glass, offers excellent transmittance in the NIR region and is often used in high-performance optical systems.

The lens features a sophisticated geometry, with a central thickness of 3.5mm and edge thickness of 3.94mm. The radii of curvature for the first and second surfaces are 26.82mm and -20.12mm, respectively, while the third surface has a radius of -61.38mm. The lens also has an inner radius of 0mm and an outer radius of 0mm.

The 49-327 is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces, enhancing its performance in the specified wavelength range. This coating provides high transmission and excellent environmental resistance, ensuring the lens maintains its optical performance over time.