The PCX-FS-025-175 from Artifex Engineering GmbH & Co. KG is a Optical Lens with Wavelength Range 587.6 nm n=1.45848, Focal Length 172.932 to 175 mm, Center Thickness 3.02 mm, Diameter 25.4 mm, Radius 80.23 mm. More details for PCX-FS-025-175 can be seen below.