The 1420FIB25 from Knight Optical (UK) Ltd is a Optical Filter with Wavelength 1413 to 1427 nm, Center Wavelength(CWL) 1420 nm, Bandwidth (FWHM) 14 nm, Blocking Wavelength 200 to 1850 nm, Filter Diameter 25 mm. More details for 1420FIB25 can be seen below.