Black and White Filter Guide
 
 
 
Color Temperature of light sources

Filter Exposure Factor

Black and White Contrast control Filters

Conversion filters for color films

Light balancing filters

Neutral Density filters

Ultraviolet- Absorbing Filters

Infrared transmitting Filters

Color compensating filters

Safelight filters

Contrast Control-Printing Filters

Color Printing Filters

 
about Color Temperature and Light sources
 
Standards of Luminous Intensity and
Their Color Temperatures
Source Color Temperature
(Kelvin)
Standard British candle
Hefner
Harcourt pentane
Acetylene
Incandescentcarbon (4 watts/candle)
Incandescent tungsten (1.25 watts/candle)
Freezing point of platinum
1930
1880
1920
2415
2080
2400
2042
 
 
 
 
Selected Practical Sources of Illumination and Their Color Temperatures
Source Color Temperature 
(Kelvin)
Mired
Value
Sunlight (mean noon)
Skylight
Photographic.Daylight
Crater of carbon arc (ordinary hard-cored)
White-flame carbon arc
Flashcube, magicube or flipflash
High-intensity carbon arc (sun arc)
Clear zirconium wire-filled flash
Clear aluminum wire-filled flash
500-watt (photoflood) approx. 34.0 lumens/watt
500-watt (3200 K photographic) approx 27.0 lumens/watt
200-watt (general service) approx 20.0 lumens/watt
100-watt (general service) approx 17.5 lumens/watt
75-watt (general service) approx 15.4 lumens/watt
40-watt (general service) approx 11.8 lumens/watt
5400
12000 to 18000
5500
4000
5000
4950
5500
4200
3800
3400
3200
2980
2900
2820
2650
185
83 to 56
182
250
200
202
182
238
263
294
312
336
345
353
377

Mired System for light conversion

                                    1.000.000
Mired value=   -------------------------------
                          color temperature in kelvin
 

Mired Values of Color Temperatures from 2000-6900 K
K 0 100 200 300 400 500 600 700 800 900
2000
3000
4000
5000
6000
500
333
250
200
167
476
323
244
196
164
455
312
238
192
161
435
303
233
189
159
417
294
227
185
156
400
286
222
182
154
385
278
217
179
152
370
270
213
175
149
357
263
208
172
147
345
256
204
169
145
 
 
T1 represent the color temperature of the original light source. represent the color temperature of the light through the filter.Using some filters, like Kodak light balancing filters, we can modify the effective color temperature. Giving to each filter a mired shift value, represented by the expression (1/T2 - 1/T1)*106
 either positive or negative, you can change the color temperature. Using yellowish filters, the mired value increases, having a positive mired shift value, resulting lower color temperature.Using bluish filters, the mired value decreases, having a negative mired sift value, resulting higher color temperature.
The above nomograph simplify to theory, showing the proper conversion filter. To find the requested filter (the mired shift value), place a straightedge on the points corresponding to the color temperature of the source,  T1,  and the color temperature of the desired sourceT2






Concept and design Elias Eliadis
Copyright 1998 Black & White Art Zone - Filterzone. All Rights Reserved. 
First published date 1 December 1998 -
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