89-174 20mm Dia. x 80mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm

The 89-174 is a high-quality double-convex lens, boasting a 20mm diameter and a focal length of 80mm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for immediate purchase, as indicated by its "in stock" status on the vendor's website.

The lens is constructed from Schott's n-BK7 glass, a material known for its excellent optical properties, including a high Abbe number and low dispersion. This makes the lens suitable for a wide range of applications, particularly where high image quality and color correction are critical.

The lens features a double-convex geometry, with radii of curvature of 82mm and -82mm for the first and second surfaces, respectively. This geometry provides a large numerical aperture, enhancing the lens' light-gathering capability and improving its performance in low-light conditions. The lens also has a relatively long focal length, which contributes to a wide field of view and low distortion.

The lens is coated with Edmund Optics' VIS-EXT coating on both the front and back surfaces. This coating is designed to enhance the lens' transmission in the visible spectrum, specifically between 350nm and 700nm. The coating reduces surface reflections, thereby improving the lens' overall light transmission and contrast.