47-659-INK 9 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=75mm VIS 0° 425-675nm

The 47-659-INK is a high-quality achromatic doublet lens, boasting a 9 mm diameter and an effective focal length (EFL) of 75mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for immediate use.

This achromatic doublet is a multiplet lens, composed of two individual lenses made from different materials: N-BK7 and N-SF5, both from Schott. The N-BK7 lens, with a refractive index of 1.5168 at 587.6nm and an Abbe number of 64.17, is used for the first element. The second element is made of N-SF5, with a refractive index of 1.6544 at 587.6nm and an Abbe number of 34.36. This combination effectively minimizes chromatic aberration, ensuring sharp and clear images.

The lens geometry includes a 4.28mm edge thickness, a 3mm center thickness, and a 1.6mm center thickness on the 'a' side. The lens features inner and outer radii of 0mm, with a first radius (r1) of 46.44mm and a second radius (r2) of -33.77mm. The third radius (r3) is -95.94mm.

Both the front and back surfaces of the lens are coated with the EDM VIS-0 standard curve coating, providing excellent transmission and protection across the visible light spectrum. This lens is circular in shape and is available for immediate use, as indicated by its valid weblink status.

For more information and specifications, please refer to the provided weblink.