67-273 50mm Dia. UVFS Aspheric Lens; EFL=60mm; NA=0.42 UV 250-425nm

This is a high-quality aspheric lens from Edmund Optics, catalog number 67-273. It is designed for use in the ultraviolet range, specifically between 250 and 425nm, making it ideal for applications such as UV imaging and spectroscopy. The lens has a diameter of 50mm and a focal length of 60mm, giving it an f-number of 1.2. The aspheric design helps to reduce spherical aberration, providing sharper images than traditional spherical lenses.

The lens is made from UV fused silica, a material known for its excellent transparency in the UV range. It has a numerical aperture (NA) of 0.42, which determines the light-gathering ability of the lens. A higher NA allows for a wider field of view and greater resolution, making this lens suitable for high-resolution applications.

The lens is coated with a UV coating (250-425nm) on both the front and back surfaces. This coating enhances the transmission of UV light, reducing reflections and improving image quality. The coating also provides some protection against environmental factors, such as dust and moisture.

The lens has a center thickness of 17mm and an edge thickness of 4.42mm. The front and back surfaces have radii of curvature of 27.508mm and 0mm, respectively. The lens also has a back focal length of 48.34mm.