This is the FS-px-50.8-76, a 50.8 mm diameter Plano-Convex lens made from UVFS material, sourced from Alkor Technologies. The lens is uncoated and has a focal length of 76.2mm (EFL).
The lens geometry is characterized by a thickness of 2.5mm at the edge and 13.4mm at the center. The curvature of the lens is defined by a radius (R1) of 35.08mm on the convex side, while the inner and outer radii on the planar side are 0mm.
The lens is designed for use at a specific wavelength of 587.6nm. It is spherical in shape and does not have any coating. The Material ID for this lens is UVFS Mal-1965.
The lens is in stock and available for immediate purchase. For more information, please refer to the vendor's website provided in the weblinks section.