49-312 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS-NIR 400-1000nm

The 49-312 is a high-quality achromatic doublet lens, boasting a 6.25 mm diameter and a focal length of 60mm, specifically designed for the visible to near-infrared spectrum (400-1000nm). This lens is sourced from the renowned optical vendor, Edmund Optics, and is a versatile choice for a wide range of optical applications.

The lens is constructed from two types of materials, N-BK7 and N-SF5, both from Schott, ensuring superior optical performance. The N-BK7, a borosilicate crown glass, is known for its excellent optical transmission and low dispersion, making it ideal for use in achromatic doublets. The N-SF5, a dense flint glass, further reduces dispersion, contributing to the lens's high chromatic correction.

The 49-312 features a sophisticated geometry, with a central thickness of 2.3mm and edge thickness of 3.1mm. The radii of curvature for the first and second surfaces are 37.16mm and -26.28mm, respectively, while the third surface has a radius of -76.48mm. This complex design ensures minimal spherical and chromatic aberration, delivering sharp, clear images.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000), which is applied to both the front and back surfaces. This coating enhances the lens's transmission in the visible to near-infrared spectrum, reducing reflection and improving overall light transmission.