45-266 18 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm MgF2 400-700nm

The 45-266 is a high-quality achromatic doublet lens, 18 mm in diameter, designed and manufactured by Edmund Optics. This lens is a multiplet, meaning it is composed of multiple optical elements to achieve superior performance. The lens is specifically designed for use in the 400-700nm spectral range, making it suitable for a wide range of applications in the visible light spectrum.

The lens features a focal length of 125mm, indicated by the EFL (Effective Focal Length) parameter. This long focal length allows for high magnification and detailed image capture. The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring high optical quality and durability.

The lens's geometry is carefully designed to optimize its performance. It has a thickness of 5.72mm at the edge and 4.5mm at the center, with an additional 2mm thickness at the center a. The lens's inner and outer radii are 0, indicating a simple, circular shape. The first and second radii of curvature (r1 and r2) are 76.92mm and -55.48mm, respectively, while the third radius (r3) is -162.59mm. These radii contribute to the lens's achromatic properties, minimizing chromatic aberration and ensuring clear, sharp images.

The lens is coated with MgF2, a standard coating that provides excellent transmission in the visible spectrum. This coating is applied to both the front and back surfaces of the lens, further enhancing its performance and durability.