The PCX-FS-025-200 from Artifex Engineering GmbH & Co. KG is a Optical Lens with Wavelength Range 587.6 nm n=1.45848, Focal Length 198.027 to 200 mm, Center Thickness 2.89 mm, Diameter 25.4 mm, Radius 91.7 mm. More details for PCX-FS-025-200 can be seen below.