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filters.
Whole systems of filters have been developed to create a variety of
effects.
Some of these can be reproduced in post processing however you have
the visual confirmation that you have captured the effect you want at the
scene before you leave.
The original Cokin™ range is sometimes how this system is known as.
Some photographers still use (as I do) the FLD filter which was used to
correct for the green color cast which was prominent when you shot
daylight film under this light.
Today we can perform a manual white balance and correct this.
However this “rose” colored filter can be used to emphasise sunsets or
when shooting urban landscapes at dusk to correct for the green
fluorescent lighting in buildings if we use daylight white balance setting in
the camera.
If you shoot within 30 minutes of the sunset (at my latitude 53° north,
sooner nearer the equator) you will retain the right blue colors in the sky,
plus the sunset hues and the neutral office buildings.