Filter factor table with Wratten to photographic factor

Filtername Type Manufacturer Manufacturer product sheet percent transmission Peak wavelength (nm) Product sheet or Kodak spec Kodak spec peak wavelength or cut-off Adopted transmission Adopted filter factor (reciporical of brightness) Adopted log Optical density Source Notes
08 Yellow, Light Cut-off Meade 0.83 580 0.89 0.89 1.13 0.05 Product spec. 83%; Kodak B-3 88.7% at 580nm
11 Yellow-Green Cut-off Meade 0.73 520 0.62 0.62 1.61 0.21 Product sheet states 73%; Kodak B-3 states 60.2%
12 Yellow Cut-off Meade 0.74 580 0.90 0.90 1.11 0.05 Product sheet states 74%, Kodak B-3 90.1%
12 Yellow, Deep Cut-off Celestron 0.74 580 0.90 0.90 1.11 0.05 Product sheet states 74%, Kodak B-3 90.1%
15 Yellow, Deep Cut-off Orion 0.67 590 0.90 0.90 1.11 0.05 Product sheet states 67%, Kodak B-3 90.1%
21 Orange Cut-off Meade 0.46 550 0.90 0.90 1.11 0.04 Product sheet states 46%, Kodak B-3 90.2% at 550nm
21 Orange Cut-off Celestron 0.46 550 0.90 0.90 1.11 0.04 Product sheet states 46%, Kodak B-3 90.2% at 550nm
23A Red, Light Cut-off Meade 0.25 690 0.90 0.90 1.11 0.05 Product sheet states 25%, Kodak B-3 90.1% at 690nm
25 Red Cut-off Orion 0.14 680 0.90 0.90 1.11 0.05 Product sheet states 14%, Kodak B-3 90% at 680nm
25 Red Cut-off Celestron 0.14 680 0.90 0.90 1.11 0.05 Product sheet states 14%, Kodak B-3 90% at 680nm
25 Red Cut-off Meade 0.14 680 0.90 0.90 1.11 0.05 Product sheet states 14%, Kodak B-3 90% at 680nm
38A Blue, Dark Bandpass Meade 0.17 430 0.58 0.58 1.74 0.24 Product sheet states 17%, Kodak B-3 57.5% at 430nm
47 Violet (Blue per Kodak) Bandpass Meade 0.03 440 0.50 0.50 1.99 0.30 Repacholi shows 50.3% at 440; Product sheet 3%
56 Green, Light Meade 0.53 0.53 1.89 0.28 Est. Kodak spec
56 Green, Light Celestron 0.53 0.53 1.89 0.28 Est. Kodak spec
58 Green Bandpass Meade 0.24 530 0.54 0.54 1.87 0.27 Product sheet states 24%, Kodak B-3 53.6% at 530nm
58 Green Bandpass Orion 0.24 530 0.54 0.54 1.87 0.27 Product sheet states 24%, Kodak B-3 53.6% at 530nm
58A Green Celestron 0.24 0.24 4.17 0.62 Est. Kodak spec
80A Blue Bandpass Meade 0.30 430 0.74 1.36 0.13 Product sheet states 30%, Kodak B-3 73.5% at 430nm
80A Blue Bandpass Celestron 0.30 430 0.74 1.36 0.13 Product sheet states 30%, Kodak B-3 73.5% at 430nm
80A Blue, medium Bandpass Orion 0.30 430 0.74 1.36 0.13 Product sheet states 30%, Kodak B-3 73.5% at 430nm
82A Blue, Light Bandpass Meade 0.73 440 0.85 1.17 0.07 Product sheet states 73%, Kodak B-3 85.4% at 440nm
905 Variable Polarizing Filter Density Meade 0.25 0.25 4.00 0.60 Max (min 0.05)
Moon Density Celestron 0.18 0.18 5.56 0.74 Product sheet
ND96 Moon Density Meade 0.13 0.13 7.69 0.89 Product sheet
Variable Polarizing Density Orion 0.40 0.40 2.50 0.40 Max (min 0.01)
No filter Baseline N/a 1.00 530 1.00 1.00 0.00 Using no filter
OIII Bandpass Lumicon 0.98 499 0.98 1.02 0.01 Product spec. est.
H-beta Bandpass Lumicon 0.98 486 0.98 1.02 0.01 Product spec. est.
H-alpha Cut-off Lumicon Ha night sky 0.90 657 0.90 1.11 0.05 Product spec. est.
V-block Bandpass Orion 0.98 530 0.98 1.02 0.01 Product spec. est.
LPR-Broadband Bandpass Orion Skyglow 0.98 490 0.98 1.02 0.01 Product spec. est.
Johnson B Bandpass Optec 17132 0.56 440 0.56 1.79 0.25 Product spec.
Johnson V Bandpass Optec 17133 0.74 530 0.74 1.34 0.13 Product spec.
Johnson R Bandpass Optec 17134 0.49 670 0.49 2.04 0.31 Product spec.
Johnson I Bandpass Optec 17135 0.86 840 0.86 1.17 0.07 Product spec.
Solar Density Orion O.D. 5 Filter 0.00 0.00 100000.00 5.00 Product sheet
Coronado PST Ha Bandpass Coronado 0.00 0.00 100000.00 5.00 Product sheet