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- λT (nm)
- Transition wavelength Midpoint between wavelength with 5% of transmittance and wavelength with 72% of transmittance
- Δλ (nm)
- Transition interval Distance between wavelength with 5% of transmittance and wavelength with 72% of transmittance
- TH (%)
- Transmittance in the high transmittance range Average transmittance in the range from wavelength with 72% of transmittance to wavelength of 800 nm.
- λ5 (nm)
- Wavelength with [ 5% ] of transmittance
- λ80 (nm)
- Wavelength with [ 80% ] of transmittance
- Tav (%)
- Average transmittance Average value of transmittances in steps of 10 nm from 400 to 700 nm
- Tmax (%)
- Maximum transmittance Transmittance of wavelength at maximum transmittance
- λs1 (nm)
- Less than 1% wavelength at short wave side
- λl5 (nm)
- Less than 5% wavelength at long wave side
- T254 (%)
- Transmittance at 254 nm
- T405 (%)
- Transmittance at 405 nm
- T435 (%)
- Transmittance at 435 nm
- T445 (%)
- Transmittance at 445 nm
- T550 (%)
- Transmittance at 550 nm
- T586 (%)
- Transmittance at 586 nm
- T750 (%)
- Transmittance at 750 nm
- T1000 (%)
- Transmittance at 1000 nm
- V (mired)
- B-R conversion values
For color photography, the Japanese Industrial Standards JIS B 7125, ″Photographic Light-Balancing Glass Filters″, specify the values for general photographic lighting.
The B-R conversion values of filters are calculated by the formula as follows: V = 221 ( Log 10 Tr - Log 10 Tb ) mired * Tr : The average value (%) of transmittances of the filter at 610 nm, 635 nm, and 655 nm of wavelengths
* Tb : The average value (%) of transmittances of the filter at 405 nm, 435 nm, and 465 nm of wavelengths.
Relationship among color temperature before filtering,
color temperature after filtering and B-R conversion values
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