49-333 12.5 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=100mm VIS-NIR 400-1000nm

The 49-333 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning from 400 to 1000nm. The lens boasts a 12.5 mm diameter and an effective focal length (EFL) of 100mm, 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 is used to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The achromatic design ensures that the lens focuses both red and blue light to the same point, providing sharper images and improved color accuracy.

The lens geometry is carefully designed with a center thickness of 3mm and edge thickness of 4.03mm. The radii of curvature for the three surfaces are r1=61.54mm, r2=-44.39mm, and r3=-130.26mm. These parameters contribute to the lens's overall performance, influencing factors such as field of view, distortion, and image quality.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces. This coating is designed to enhance the lens's transmission in the VIS-NIR range, reducing reflections and improving light transmission.