47-696-INK 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=40mm VIS 0° 425-675nm

The 47-696-INK is a high-quality achromatic doublet lens, boasting a 6.25 mm diameter and an effective focal length (EFL) of 40 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase directly from their website.

This achromatic doublet is composed of two distinct materials: N-BK7 from Schott and N-SF5 from Schott. The lens's geometry is expertly crafted, with a thickness of 3.01 mm at the edge, a central thickness of 2.3 mm, and a thickness of 1 mm at the center a. The lens's inner and outer radii are optimized for performance, with values of 0 and 0, respectively. The first and second radii of curvature (r1 and r2) are 25.05 mm and -17.27 mm, respectively, while the third radius of curvature (r3) is -49.33 mm.

The 47-696-INK lens features advanced coatings on both the front and back surfaces. These coatings, identified as "edm vis-0 std curve," are specifically designed to enhance the lens's performance within the visible light spectrum. The lens's shape is classified as a multiplet, further attesting to its sophisticated design and superior optical capabilities.