49-346 18 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=80mm VIS-NIR 400-1000nm

The 49-346 is an 18 mm diameter achromatic doublet lens, designed and manufactured by Edmund Optics. This lens is specifically engineered for use within the visible to near-infrared spectrum, spanning from 400 to 1000 nanometers. The achromatic design ensures minimal chromatic aberration, making it an ideal choice for a wide range of optical applications.

The lens features a focal length of 80mm, indicated by the EFL (Effective Focal Length) parameter. This length, combined with the lens's diameter, contributes to a compact and efficient optical system. The geometry of the lens includes a thickness of 6.27mm at the edge, reducing to 5mm at the center, and further to 2.5mm at the center aperture. This tapered design helps to minimize weight and bulk while maintaining optical performance.

The lens is composed of two types of glass: N-BK7 and N-SF5, both from Schott. These materials were chosen for their excellent optical properties and compatibility within the specified wavelength range. 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 capabilities and reduces surface reflections, further improving overall system performance.