The 49-770 is a high-quality achromatic doublet lens from Edmund Optics, designed with a 25.4 mm diameter and a focal length of 101.6mm. This lens is a multiplet, meaning it is composed of multiple optical elements to achieve superior performance.
The lens is constructed from two types of glass, N-BAK1 and N-SF15, both from Schott. These materials are chosen for their specific refractive indices and dispersions, which contribute to the lens's ability to bring two wavelengths to a common focus, minimizing chromatic aberration.
The lens's geometry is carefully designed with a central thickness of 5mm and edge thickness of 6.32mm, providing structural integrity and optimal light transmission. The inner and outer radii are 0, indicating a symmetrical design that further enhances image quality.
The 49-770 is coated with EDM MgF2, a standard coating that provides excellent anti-reflection properties across the visible spectrum (400-700nm). This coating improves light transmission, reduces ghosting and flare, and enhances overall image contrast and clarity.