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Edge filters
Edge filters block the light in a defined spectral region while transmites in a closely adjacent region . If the transmission region lies in the longer wave region compared with the rejection region, the filters are called long pass filters or cut on filters. In the inverse case, the filters are short pass filters or cut off filters.
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Longpass
Tmax is the maximum transmittance in the transmitted area, Tmin is the minimum transmittance in the transmitted area.Tave is the average transmittance in the transmitted area, Tave=(Tmax+Tmin)/2.
Cut-On is defined as the position of the transmittance T=50%. δ expresses the relative width of the wavelength interval between the passband region and the blocking region relative to the wavelength position of the filter. The smaller this value, the steeper the filter's transmission curve. δ=(λ2-λ1)/λ0*100.
Shortpass
Tmax is the maximum transmittance in the transmitted area, Tmin is the minimum transmittance in the transmitted area.Tave is the average transmittance in the transmitted area, Tave=(Tmax+Tmin)/2.
Cut-off is defined as the position of the transmittance T=50%. δ expresses the relative width of the wavelength interval between the passband region and the blocking region relative to the wavelength position of the filter. The smaller this value, the steeper the filter's transmission curve. δ=(λ2-λ1)/λ0*100.
