Colour Filters
Filters in colour photography can be used either for correction for light conditions or to produce dramatic effects.
| Light Source | Daylight Film | Tungsten Film |
|---|---|---|
| Daylight | -- | 85B |
| Daylight (overcast) | 81A | 85B + 81A |
| Flash (electronic) | -- | 85B |
| Flashbulb (blue) | -- | 85B |
| 3200 K Lamps | 80A | -- |
| 3400 K Photolamps | 80B | 81A |
Other Filters
Skylight (UV) Filter: this filter serves the main purpose of protecting the lens but also eliminates UV and in invisible light rays.
Neutral Density Filter: this maximises the use of shutter speed and aperture in very bright light conditions or when using high speed film as it can reduce the amount of light entering the lens.
Polarising Filter: this can be used to minimise reflection and can act as a neutral density filter. Circular polarising filters can be used to enhance the blueness of the sky and to make white clouds stand out.
Special Effects Filters:
These can be used to produce strong casts and thereby produce a dramatic effect on the final image. The following filters are examples of colour filters that can be used. The Wratten Number series is an arbitrary system used commonly for rating these filters.
| Colour | Wratten Number |
|---|---|
| Deep Red | 29 |
| Medium Red | 25 |
| Red-Orange | 23A |
| Medium Yellow | 8 |
| Light Green | 57 |
| Deep Green | 58 |
| Deep Blue | 47 |
| Blue-Green | 44A |
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