LONG PASS FILTERS
EDGE FILTERS PASSING LONG WAVELENGTHS
A long pass filter has low transmission in the short wave region (blocking range) and high transmission in the long wave region (passband).
The important property is the edge position where the wavelength is half of the maximum value in the passband. For example: RG610 has a typical edge position of 50% transmission at 610nm at a given glass thickness of 2mm.