49-316 9 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=36mm VIS-NIR 400-1000nm

The 49-316 is a high-quality achromatic doublet lens, sourced from the renowned optical component vendor, Edmund Optics. This lens is specifically designed for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm. The lens features a 9mm diameter and an effective focal length (EFL) of 36mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, a leading manufacturer of high-grade optical glass. This combination is used to correct chromatic aberration, a common issue in lens systems where different wavelengths of light are focused at different points. The achromatic design ensures that the lens focuses both red and blue light at the same point, providing sharp, clear images.

The lens geometry includes a thickness of 3.32mm at the edge, with a central thickness of 2.5mm. The lens features a concave-convex-concave configuration, with radii of curvature of 22.16mm, -15.98mm, and -46.14mm respectively. This unique shape contributes to the lens's high optical performance.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces. This coating is designed to enhance the lens's transmission in the VIS-NIR range, reducing reflection and improving image quality.