Band-pass glass referred to as band-pass bandwidth of the glass is a narrow, short and long end of the glass significantly, as shown. The spectral characteristics of the transmittance maximum (TM) and wavelength (λM) position, short-wave cut-off wavelength, long wavelength cut-off wavelength and half width said.

The maximum transmission through the glass with more than half the wavelength corresponding to the difference between λ1 and λ2 (λ1-λ1) nm called the half-width. Short-wave cut-off wavelength is the peak short-wave side of the transmission wavelength than zero. As glass is a long-wave peak long wave length side, the transmission wavelength than zero, and some species, in the long wavelength side of the glass transmittance of less than zero, places a particular wavelength transmittance said. Band-pass glass to Hanyu Pinyin to name the first letter of DTB, the transmission wavelengths than the maximum value as their number