49-793-INK 25.4 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=63.5mm VIS-NIR 400-1000nm

The 49-793-INK is a high-quality achromatic doublet lens, designed and manufactured by Edmund Optics. This lens, with a diameter of 25.4 mm, is specifically engineered for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning from 400 to 1000nm. The lens is characterized by its effective focal length (EFL) of 63.5mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of glass, N-SSK8 and N-SF56, both from Schott. This combination of materials helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The use of these materials in a doublet configuration ensures that the lens provides sharp, clear images across the entire spectral range.

The lens geometry is carefully designed to optimize performance. It has a thickness of 8.89mm at the edge, with an inner radius and outer radius of 0. The center thickness is 8mm, reducing to 3.5mm at the center a. The lens also features radii of curvature of 42.26mm and -33.37mm, and -123.45mm, further enhancing its optical properties.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces. This coating is designed to maximize transmission and minimize reflection, ensuring optimal performance in the specified spectral range.