The LNS-254-R900-R326-BK7 from Castech Inc. is a Optical Lens with Wavelength Range 589 nm, Focal Length -100.0 mm, Center Thickness 2.32 mm, Diameter 25.4 mm (1 Inch), Radius -33.8 mm, 100 mm. More details for LNS-254-R900-R326-BK7 can be seen below.