33-399 25mm Dia. x 200mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

The 33-399 is a high-quality double-convex lens, designed and manufactured by Edmund Optics, a leading provider of advanced optical solutions. This lens boasts a 25mm diameter and a focal length of 200mm, making it suitable for a wide range of applications that require precise optical performance.

The lens is constructed from N-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. The base shape of the lens is circular, and it features a double-convex geometry, with radii of curvature of 205.865mm and -205.865mm for the first and second surfaces, respectively. This geometry results in a high refractive power, making the lens ideal for imaging and beam shaping applications.

The lens has an effective focal length (EFL) of 200mm, and the thickness at the edge and center are 4.24mm and 5mm, respectively. The back focal length (BFL) is 198.35mm, providing ample space for mounting or additional optical components. The lens does not have any inner or outer radius, indicating a uniform thickness across the lens.

The 33-399 lens is coated with Edmund Optics' standard NIR-II coating on both the front and back surfaces. This coating is specifically designed for the near-infrared (NIR) spectrum, covering the wavelength range of 750-1550nm. The coating enhances the lens's transmission and reduces reflection, ensuring optimal performance in NIR applications.