62-489-INK 12.5 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-75mm VIS 0° 425-675nm

The 62-489-INK is a high-quality negative achromatic doublet lens, sourced from the renowned optical component vendor, Edmund Optics. This lens, with a diameter of 12.5 mm, is designed for use in the visible light spectrum, specifically between 425 and 675 nanometers.

The lens features a focal length of -75mm, making it suitable for a wide range of optical applications. It is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring high-quality performance and durability. The lens is coated with EDM VIS-0 standard curve coatings on both the front and back surfaces, further enhancing its performance in the visible light spectrum.

The geometry of the lens is carefully designed, with an edge thickness of 6.05mm, a center thickness of 2.5mm, and a central thickness 'a' of 3mm. The lens's inner and outer radii are 0, indicating a circular shape. The lens's first radius of curvature (r1) is -46.07mm, and the second radius (r2) is 36.65mm, while the third radius (r3) is 108mm.

This lens is a multiplet, meaning it is composed of multiple elements. It is available for purchase directly from the Edmund Optics website, where more detailed specifications and technical drawings can be found. The product link is: https://www.edmundoptics.com/p/125mm-dia-x75mm-fl-vis-0deg-inked-negative-achromatic-lens/17113/