This set contains four 100mm x 100mm mounted polyester filters, each of which has a different effect on the tones in a black and white image by absorping different quantities of colour in the blue and blue-green parts of the spectrum. The filters can also be used for special effects.
Filter
|
Colour |
Approx Exposure Increase
|
8
|
Yellow |
1/3 Stop
|
11
|
Yellow Green
|
11/3 Stops
|
21
|
Orange |
1 Stop
|
23a
|
Light Red
|
2 Stops
|