The 810FIR50 from Knight Optical (UK) Ltd is a Optical Filter with Wavelength 790 to 830 nm, Center Wavelength(CWL) 810 nm, Bandwidth (FWHM) 40 nm, Blocking Wavelength 200 to 1150 nm, Filter Diameter 50 mm. More details for 810FIR50 can be seen below.