49-933 20 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=50mm MgF2 400-700nm

The 49-933 is a high-quality achromatic doublet lens, boasting a 20 mm diameter and a focal length of 50 mm. 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 currently active and indicates that the item is in stock, ensuring prompt delivery upon order placement.

The lens is constructed from two types of glass, N-SSK8 and N-SF56, 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's geometry is meticulously designed, with an inner radius of 0 mm, an outer radius of 0 mm, and a central thickness of 4.8 mm. The edge thickness is slightly larger at 4.78 mm, providing additional structural support.

The lens features a front and back coating of EDM MgF2, a standard coating that offers excellent broadband anti-reflection performance across the 400-700 nm spectrum. This coating enhances the lens's light transmission capabilities, reducing unwanted reflections and improving overall image quality.

The lens is classified as a multiplet, indicating that it is composed of multiple elements. This design allows for more complex optical corrections, making the 49-933 an ideal choice for various applications that demand high-resolution, distortion-free imaging.