47-668 12.5 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS 0° 425-675nm

The 47-668 is a high-quality achromatic doublet lens, boasting a 12.5 mm diameter and an effective focal length (EFL) of 60mm, 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 purchase through their official website.

The lens is constructed from two types of materials: N-BK7 and N-SF5, both from Schott, ensuring excellent optical performance. The N-BK7, a borosilicate crown glass, is known for its low dispersion and exceptional homogeneity, while the N-SF5, a fluorite crown glass, offers a low refractive index and low dispersion. This combination effectively minimizes chromatic aberration, delivering sharp and clear images.

The lens features a sophisticated geometry, with a thickness of 4.21mm at the edge and 3.5mm at the center. The first radius of curvature (r1) is 36.51mm, while the second radius (r2) is -26.33mm and the third radius (r3) is -78.35mm. The lens also has an inner radius of 0mm and an outer radius of 0mm.

The 47-668 lens comes with standard EDM VIS-0 coatings on both the front and back surfaces, providing improved light transmission and enhanced durability. The lens is designed in a multiplet shape, offering versatility and precision in various optical applications.