49-347-INK 18 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS-NIR 400-1000nm

The 49-347-INK is an 18 mm diameter 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 focal length of 125mm, indicated by the EFL (Effective Focal Length) parameter. This makes it suitable for applications that require a longer focal length, such as high-resolution imaging or laser beam focusing.

The achromatic design of the lens involves two optical elements made from different materials, N-BK7 and N-SF5, to correct chromatic aberration. This design ensures that the lens focuses different wavelengths of light onto the same point, improving the overall image quality.

The lens has a center thickness of 4.5mm and edge thickness of 5.72mm, providing structural rigidity and resistance to deformation. The inner and outer radii are 0mm, indicating a symmetrical design that can help to minimize distortion.

The lens is coated with edm visnir0sp2002000 on both the front and back surfaces. This coating is designed to enhance the lens's performance in the VIS-NIR spectrum, improving transmission and reducing reflection.

The lens is currently in stock and available for purchase through the Edmund Optics website.