89-178 25mm Dia. x 40mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm

The 89-178 is a high-quality double-convex lens, boasting a 25mm diameter and a focal length of 40mm. 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 company's website.

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

The lens features a double-convex geometry, with radii of curvature of 40.42mm for both the front and rear surfaces. This geometry results in a high optical power, making the lens ideal for use in imaging systems, beam shaping, and other applications where a strong focusing effect is required.

The lens is coated with Edmund Optics' VIS-EXT coating on both the front and rear surfaces. This coating is designed to enhance the lens's performance in the visible spectrum, specifically between 350nm and 700nm. It reduces surface reflections, thereby increasing transmission and improving image contrast and quality.

The lens has a center thickness of 5.3mm and an edge thickness of 1.34mm, providing a robust and durable construction. Despite its robustness, the lens maintains a compact profile, making it suitable for use in systems with limited space.