67-657 25mm Dia. x 200mm FL; NIR II Coated; DCX N-K5 Lens NIR II 750-1550nm

The 67-657 is a high-performance spherical lens, boasting a 25mm diameter and a focal length of 200mm, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use in the near-infrared (NIR) spectrum, with a wavelength of 587.6nm, and is coated with the EDM NIR-II standard curve on both the front and back surfaces.

The lens is constructed from the high-quality material N-K5, a type of glass manufactured by Schott, ensuring durability and excellent optical performance. The geometry of the lens is meticulously designed, with an edge thickness of 4.25mm and a center thickness of 5mm. The effective focal length (EFL) is 200mm, and the back focal length (BFL) is 198.35mm, providing a long focal length for various applications.

The lens features a convex-convex base shape and a circular geometry, making it suitable for a wide range of optical systems. The inner and outer radii are 0mm, indicating a simple and efficient design. The coating on the lens is specifically tailored for NIR applications, providing superior transmission and minimal reflection in the 750-1550nm range.