49-947 5 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=12.5mm VIS-NIR 400-1000nm

The 49-947 is a high-quality achromatic doublet lens, sourced from the renowned optical component vendor, Edmund Optics. This lens, with a 5 mm diameter, is specifically designed for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm.

The lens is a multiplet, meaning it is composed of multiple optical elements. In this case, it is made from two different materials: N-SSK8 and N-SF56, both from Schott, a leading manufacturer of optical glass. This combination helps to correct chromatic aberration, a common issue in lenses where different wavelengths of light are focused at different points.

The lens has an effective focal length (EFL) of 12.5mm, which is the distance from the lens's principal point to the focal point where the light rays converge. The lens's geometry includes a thickness of 2.78mm at the edge, a center thickness of 2.3mm, and a center thickness 'a' of 1mm. The lens's inner and outer radii are 0, and it has a first radius (r1) of 8.57mm and a second radius (r2) of -6.22mm.

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 performance in the VIS-NIR spectrum, improving transmission and reducing reflection.

The 49-947 lens is currently in stock and available for purchase through the Edmund Optics website, as indicated by its valid weblink status. This lens is a versatile and high-performing option for applications in the VIS-NIR spectrum.