49-934 20 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=80mm MgF2 400-700nm

This is a 20 mm diameter achromatic doublet lens, catalog number 49-934, sourced from the renowned optical components vendor, Edmund Optics. The lens is specifically designed for use in the 400-700nm spectral range, making it suitable for a wide range of optical applications.

The lens is a multiplet, meaning it is composed of multiple optical elements. In this case, it is made up of two different materials: 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 lens has an effective focal length (EFL) of 80mm, which is the distance from the lens's principal point to the focal point. This is a crucial parameter in lens selection as it directly impacts the field of view and the magnification of the system.

The lens surfaces are coated with Edmund Optics' standard MgF2 coating, which is designed to provide high transmission in the visible spectrum. This coating helps to reduce reflection and increase the overall efficiency of the optical system.

The lens has a center thickness of 4mm and an edge thickness of 4.51mm. The inner and outer radii are not specified, indicating that they are not critical parameters for this particular lens.

For more information and to purchase this product, please visit the following link: https://www.edmundoptics.com/p/20mm-daa-x-80mm-fl-mgfsub2sub-coated-achromatic-doublet-lens/10437/