47-692-INK 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=20mm VIS 0° 425-675nm

The 47-692-INK is a high-quality achromatic doublet lens, boasting a 6.25 mm diameter and an effective focal length (EFL) of 20 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is sourced from the reputable optical vendor, Edmund Optics, and is available for purchase through their website.

The lens is constructed from two types of glass: N-BK7 and N-SF5, both from Schott, ensuring excellent optical performance. The front and back surfaces of the lens are coated with EDM VIS-0 standard curve coatings, providing improved light transmission and protection against environmental factors.

The lens geometry is carefully designed with a 3 mm thickness at the edge, a 2.7 mm thickness at the center, and a 0.9 mm thickness at the center a. The lens features two radii on the first and second surfaces, measuring 12.3 mm and -8.71 mm, respectively, and a third radius on the third surface measuring -24.98 mm. The lens has an inner radius of 0 mm and an outer radius of 0 mm.

This achromatic doublet lens is a multiplet, meaning it is composed of multiple optical elements. Its design effectively minimizes chromatic aberration, making it an ideal choice for various applications that require sharp, clear images across the visible light spectrum.