التحكم بسطوع السماء .. كتاب فن التصوير الفوتوغرافي

Sky brightness control

One of the most common uses of filters is to use them to darken a blue sky in order to show its clouds, or to photograph a person with a background in the sky. If it is required to make the sky a little dark, a light-colored filter such as the K2 filter is used. But if it is required to make the sky dark to a large extent, then a contrast filter is used, such as a dark yellow or red filter. Photo 4 is of a brightly lit landscape with a cloudy sky, taken without a filter, as the clouds appear to be much less light than meets the eye. A yellow filter was used in image E to show those clouds, and a dark yellow filter was used in image 6 to give the clouds a greater impact.

If we used a red filter, the sky would appear almost black. Table III gives recommendations for the use of filters to show the sky in the best way under various conditions.

The type of film used, the filter used,
Show clear sky (black and white)

Orthochromatic
Without a filter, the sky looks lighter than it should
panchromatic
Without a filter, the sky looks a little lighter than it should
Orthochromatic
K2 light yellow, correct view of the sky
panchromatic
K2 light yellow, correct view of the sky
panchromatic
Dark yellow G, the sky looks darker than it should be
panchromatic
Bright Red A The sky looks very dark
panchromatic
Dark red F, the sky appears almost black
Infrared
A bright red, the sky appears black