49-942-INK 15 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS 0° 425-675nm

The 49-942-INK is a high-quality achromatic doublet lens, sourced from Edmund Optics, with a diameter of 15 mm and a focal length of 60 mm. This lens is specifically designed for the visible spectrum, covering wavelengths from 425 to 675 nm.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, which are renowned for their optical quality. The use of these materials in a doublet configuration helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.

The lens features a standard anti-reflection coating on both the front and back surfaces, specifically the EDM VIS-0 STD curve. This coating is designed to reduce surface reflections, thereby increasing the amount of light transmitted through the lens and improving overall system performance.

The lens has a central thickness of 3.5 mm and an edge thickness of 4.37 mm. The inner and outer radii are not specified, indicating that they are not critical to the lens's performance. However, the lens does have a significant curvature, with radii of 37.23 mm and -26.69 mm on the first and second surfaces, respectively, and a -76.36 mm radius on the third surface.