45-217 30 mm Dia. N-SK11/N-SF5 Achromatic Doublet; EFL=125mm MgF2 400-700nm

The 45-217 is a high-quality achromatic doublet lens, boasting a 30 mm diameter and an effective focal length of 125mm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase on their official website. The product link provided is valid and indicates that the item is currently in stock.

The lens is constructed from two types of glass, N-SK11 and N-SF5, both from the reputable Schott glass catalog. This combination allows for superior optical performance, particularly in managing chromatic aberration, a common issue in lens systems. The lens is coated with MgF2, a standard coating that provides excellent transmission in the 400-700nm range, making it suitable for a wide range of optical applications.

The lens geometry is carefully designed, with an inner radius of 0 and an outer radius of 0, indicating a symmetrical design. The thickness at the edge is 5.52mm, while the center thickness is 4.92mm. The lens also features a secondary center thickness (thickness center a) of 2.5mm, providing additional design flexibility.

The lens is classified as a multiplet, indicating that it is composed of multiple elements. This design allows for more complex optical corrections, contributing to the lens's high performance. The lens's base shape is circular, ensuring uniform illumination and minimal distortion.