49-367 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=275mm VIS-NIR 400-1000nm

The 49-367 is a high-quality achromatic doublet lens, designed and manufactured by Edmund Optics. This lens is specifically engineered for use in the visible (VIS) and near-infrared (NIR) spectrum, with a wavelength range of 400-1000nm. The lens features a 25mm diameter and an effective focal length (EFL) of 275mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott. This combination 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 ensures that the lens provides sharp, clear images across the entire spectrum it is designed to cover.

The 49-367 lens features a complex geometry, with three radii of curvature (r1, r2, and r3) and varying thicknesses at the edge, center, and center-a. This design allows for precise control over the lens's optical properties, enabling it to deliver superior performance.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000), which is applied to both the front and back surfaces. This coating is designed to reduce reflection and improve transmission, further enhancing the lens's performance.