45-090 3 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=9mm MgF2 400-700nm

The 45-090 is a high-quality achromatic doublet lens, sourced from the renowned optical components manufacturer, Edmund Optics. This lens is designed with a base shape of 3 mm diameter and a focal length of 9mm, making it suitable for a wide range of optical applications.

The lens is composed of two elements, made from N-BK7 and N-SF5 Schott glass, respectively. These materials are chosen for their excellent optical properties, including high transparency and low dispersion. The combination of these materials in a doublet configuration effectively corrects chromatic aberration, ensuring sharp and clear images across the visible spectrum (400-700nm).

The lens features a standard MgF2 coating on both the front and back surfaces. This coating enhances the lens's performance by reducing reflection and increasing transmission, thereby improving light efficiency. The coating is also designed to withstand environmental changes, ensuring the lens maintains its performance over time.

The geometry of the lens is carefully designed to optimize its optical performance. The edge thickness is 2.19mm, while the center thickness is 1.47mm. The lens also features a curvature radius of 5.26mm and -3.98mm for the first and second surfaces, respectively, and -12.05mm for the third surface. The inner and outer radii are both zero, indicating a circular shape.