PAC064 25.4 mm Dia. N-BK7/N-SF5 Visible Achromatic Doublet; EFL=200mm MgF2 400-700nm

The PAC064 is a high-quality achromatic doublet lens from the renowned optical vendor MKS/Newport. This lens, with a diameter of 25.4 mm, is designed for use in the visible spectrum, specifically between 400-700nm.

The lens is a multiplet, meaning it is composed of multiple optical elements. In this case, it is made from two types of glass: N-BK7 and N-SF5, both from Schott. This combination helps to correct chromatic aberration, a common issue in lens systems where different wavelengths of light are focused at different points.

The lens has an effective focal length (EFL) of 200mm, which is the distance from the lens's principal point to the focal point where light rays converge. This makes it suitable for applications that require a long focal length.

The PAC064 features a robust design with a thickness of 5.3mm at the edge and 6.3mm at the center. The lens's geometry is circular, and it has a curvature radius of 121.712mm for the first surface and -89.718mm and -268.159mm for the second and third surfaces, respectively.

The lens is coated with MgF2, a broadband antireflection coating that reduces surface reflections and increases transmission in the visible spectrum. This coating is applied to both the front and back surfaces of the lens, ensuring optimal performance.