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Old 6th April 2014, 04:08 PM
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Argentum Argentum is offline
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Location: Sceptred Isle
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Regarding sky. You will no doubt have seen photos where the sky is black. This can be achievable easily sometimes and other times it is impossible.

In the UK we call the sky blue but in reality it is far more cyan than blue. The opposite of cyan is red so a red filter will darken skies the most. However, that often just doesn't work. Only when the sky is a darker more towards blue rather than cyan does filtration really start to work in darkening plain sky.

At higher altitudes the sky is much darker blue. I have some images taken at high altitude in the alps where with just a light yellow filter the sky is rendered almost black. Using the same filter in the UK at low altitude and where there is a lot more moisture in the air and the effect is far less, hardly noticeable.

So RED has the most effect but if you want most effect then best time is when there is little humidty and that is usually on cold crisp days in winter, especialy very early morning.

but be warned, using that RED will also darken shadows on the ground and may block up all your shadow detail making the result look very harsh.
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