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Exposure chart
With TTL metering you need not adjust for the filter but for those who have asked here is the Absorption data
Filter Factor indicates the exposure increase required for a filter:
For example the filter factor is 8 for the #003 red filter. Without the filter in place the exposure meter indicates an exposure of 1/250 second at f/11. So with a of Filter factor 8 (divide 8 into 250) = 1/30 second at f/11. This gives us a 3 stop increase in exposure.
Ref #
|
Designation
|
Filter Factor
|
F-Stop
|
001
|
2
|
1
|
|
002
|
2.5
|
1.1/3
|
|
003
|
8
|
3
|
|
004
|
4
|
2
|
|
005
|
4
|
2
|
|
006
|
1.5
|
2/3
|
|
020
|
2.4
|
1.1/3
|
|
021
|
2
|
1
|
|
022
|
2.4
|
1.1/3
|
|
023
|
1.3
|
1/3
|
|
124
|
1.5
|
2/3
|
|
025
|
1.6
|
2/3
|
|
026
|
1.4
|
1/3
|
|
027
|
1.4
|
1/3
|
|
028
|
1.4
|
1/3
|
|
029
|
2
|
1
|
|
030
|
2
|
1
|
|
031
|
2.3
|
1.1/3
|
|
035
|
1.3
|
1/3
|
|
036
|
2.4
|
1.1/3
|
|
037
|
1.5
|
2/3
|
|
040
|
1.3
|
1/3
|
|
041
|
1.3
|
1/3
|
|
042
|
1.3
|
1/3
|
|
045
|
2
|
1
|
|
046
|
2
|
1
|
|
047
|
1.5
|
2/3
|
|
050
|
2.3
|
1.1/3
|
|
055
|
1.5
|
2/3
|
|
056
|
1.5
|
2/3
|
|
057
|
1.5
|
2/3
|
|
058
|
1.5
|
2/3
|
|
059
|
1
|
-
|
|
060
|
1.3
|
1/3
|
|
061
|
1.3
|
1/3
|
|
062
|
1.3
|
1/3
|
|
063
|
1.3
|
1/3
|
|
064
|
1.3
|
1/3
|
|
065
|
1.3
|
1/3
|
|
066
|
1.3
|
1/3
|
|
067
|
1.3
|
1/3
|
|
068
|
1.3
|
1/3
|
|
070
|
1.3
|
1/3
|
|
071
|
1.3
|
1/3
|
|
072
|
1.3
|
1/3
|
|
073
|
1.3
|
1/3
|
|
074
|
1.3
|
1/3
|
|
075
|
1.3
|
1/3
|
|
076
|
1.3
|
1/3
|
|
077
|
1.3
|
1/3
|
Ref #
|
Designation
|
Filter Factor
|
F-Stop
|
078
|
1.3
|
1/3
|
|
080
|
-
|
-
|
|
081
|
-
|
-
|
|
082
|
1.5
|
2/3
|
|
083
|
1.3
|
1/3
|
|
084
|
1.3
|
1/3
|
|
085
|
1.3
|
1/3
|
|
086
|
1.3
|
1/3
|
|
087
|
1.3
|
1/3
|
|
088
|
1.3
|
1/3
|
|
089
|
1.3
|
1/3
|
|
091
|
1.3
|
1/3
|
|
092
|
1.3
|
1/3
|
|
093
|
1.3
|
1/3
|
|
101
|
1.3
|
1/3
|
|
102
|
1.3
|
1/3
|
|
103
|
1.3
|
1/3
|
|
111
|
1.3
|
1/3
|
|
112
|
1.3
|
1/3
|
|
113
|
1.3
|
1/3
|
|
120
|
1.3-2
|
1/3-1
|
|
121
|
1.3-4
|
1/3-2
|
|
121L
|
1.3-4
|
1/3-1.2/3
|
|
121S
|
1.3-8
|
1/3-3
|
|
121F
|
1.2/3-8
|
1/3-3
|
|
122
|
1.3-2
|
1/3-1
|
|
123
|
1.3-4
|
1/3-2
|
|
123L
|
1.3-2
|
1/3-1
|
|
123S
|
1.3-4
|
1/3-2
|
|
123F
|
1.5-8
|
1.2/3-3
|
|
124
|
1.3-2
|
1/3-1
|
|
125
|
1.3-16
|
1/3-4
|
|
125L
|
1.3-4
|
1/3-2
|
|
125S
|
1.3-8
|
1/3-3
|
|
125F
|
1.5-8
|
2/3-3
|
|
126
|
1.3-4
|
1/3-2
|
|
128
|
1.3-4
|
1/3-2
|
|
129
|
1.3-4
|
1/3-2.5
|
|
130
|
1.3-4
|
1/3-2
|
|
131
|
1.3
|
1/3-3
|
|
132
|
1.3
|
1/3-2
|
|
133
|
1.3
|
1/3-3
|
|
138
|
Gradual FLW
|
1.3
|
1/3-1
|
139
|
Gradual FLD
|
1.3
|
1/3-1
|
140
|
1.3
|
1/3
|
|
141
|
1.3
|
1/3
|
|
142
|
1.3
|
1/3
|
|
143
|
1.3
|
1/3
|
|
144
|
1.3
|
1/3
|
|
145
|
1.3
|
1/3
|
Ref #
|
Designation
|
Filter Factor
|
F-Stop
|
148
|
1.3
|
1/3
|
|
149
|
1.3
|
1/3
|
|
150
|
1.3
|
1/3
|
|
151
|
1.3
|
1/3
|
|
152
|
2
|
1
|
|
153
|
4
|
2
|
|
154
|
8
|
3
|
|
160
|
4
|
2
|
|
161
|
4
|
2.1/3
|
|
162
|
4
|
2.1/3
|
|
163
|
4
|
2.1/3
|
|
164
|
4
|
2
|
|
165
|
1.5
|
2/3
|
|
170
|
4
|
2
|
|
171
|
4
|
2
|
|
172
|
4
|
2
|
|
173
|
4
|
2
|
|
174
|
4
|
2
|
|
185
|
1.3
|
1/3
|
|
186
|
-
|
-
|
|
187
|
1.5
|
2/3
|
|
188
|
1.3
|
1/3
|
|
189
|
1.5
|
2/3
|
|
190
|
-
|
-
|
|
191
|
-
|
-
|
|
192
|
-
|
-
|
|
193
|
-
|
-
|
|
195
|
1.3
|
1/3
|
|
196
|
1.3
|
1/3
|
|
197
|
2
|
1
|
|
198
|
4
|
2
|
|
201
|
1.5
|
2/3
|
|
202
|
1.5
|
2/3
|
|
203
|
1.5
|
2/3
|
|
204
|
1.5
|
2/3
|
|
209
|
1.5
|
2/3
|
|
216
|
2
|
1
|
|
217
|
2
|
1
|
|
219
|
2
|
1
|
|
220
|
-
|
-
|
|
230
|
-
|
-
|
|
232
|
-
|
-
|
|
340
|
-
|
-
|
|
342
|
-
|
-
|
|
345
|
-
|
-
|
|
346
|
-
|
-
|
|
375
|
-
|
-
|
|
376
|
-
|
-
|
|
397
|
-
|
-
|
|
660
|
1.3-2
|
1/3-1
|
Ref #
|
Designation
|
Filter Factor
|
F-Stop
|
661
|
1.3-4
|
1/3-2
|
|
662
|
1.3-2
|
1/3-1
|
|
663
|
1.3-4
|
1/3-2
|
|
664
|
1.3-2
|
1/3-1
|
|
665
|
1.3-4
|
1/3-2
|
|
666
|
1.3-2
|
1/3-1
|
|
667
|
1.3-4
|
1/3-2
|
|
668
|
1.3-2
|
1/3-1
|
|
669
|
1.3-4
|
1/3-2
|
|
670
|
1.3-2
|
1/3-1
|
|
671
|
1.3-4
|
1/3-2
|
|
672
|
2
|
1
|
|
673
|
2
|
1
|
|
674
|
2
|
1
|
|
694
|
1.3
|
1/3
|
|
695
|
1.3
|
1/3
|
|
696
|
1.2
|
2/3
|
|
820
|
1.3
|
1/3
|
|
830
|
1.3
|
1/3
|
|
840
|
1.3
|
1/3
|
|
850
|
1.3
|
1/3
|
Filter Factor indicates the exposure increase required for a filter:
For example the filter factor is 8 for the #003 red filter. Without the filter in place the exposure meter indicates an exposure of 1/250 second at f/11. So with a of Filter factor 8 (divide 8 into 250) = 1/30 second at f/11. This gives us a 3 stop increase in exposure.
Here are the most practical filters with their Cokin numbers and Kodak equivalents:
001: Kodak #8 yellow
002: Kodak # 21 Orange
003: Kodak # 25 Red
004: Kodak # 58 Green
006: Kodak # 11 yellow green
020: Full tungsten correction, blue (80A)
021: Half tungsten correction, light blue(80C)
022: Cooling - very light blue (82B or 82C)
027: Slight warming (81B)
028: Warming (81C)
029: Half daylight correction, light orange (85A)
030: Full daylight correction, orange (85B) as in all Super8 film cameras
047: Full daylight correction and warming for under water photography
Note: 020/030 and 021/029 are complementary filters, the one cancelling out the other, or together producing neutral grey.
To get an accurate balancing of the light source to your film you can use the Mired System to calculate which filter or combination of filters you need to get "perfect color". Lionel Armstrong has made up a handy chart to explain The Finer Points of Color Correction
To ask a technical question you can go to Yahoo's Cokin Filter Club
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