49-952 12.5 mm Dia. N-BAF10/N-SF57 Achromatic Doublet; EFL=17.5mm VIS-NIR 400-1000nm

The 49-952 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm. The lens boasts a 12.5mm diameter and an effective focal length (EFL) of 17.5mm, making it a versatile choice for a wide range of optical applications.

The lens is constructed from two types of glass, N-BAF10 and N-SF57, both from Schott. This combination is used to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. By using these specific types of glass, the lens can bring two wavelengths to a common focus, significantly improving the overall image quality.

The 49-952 lens features a robust design, with a thickness of 5.08mm at the edge and 5.8mm at the center. The center thickness can be further reduced to 1.5mm with the use of a spacer (not included). The lens also has a curved shape, with radii of 12.2mm and -9.82mm on the first and second surfaces, respectively, and a -39.19mm radius on the third surface.

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