For photography on location with natural light most favorable sunny weather, but a bad, rainy has its positive side for shooting, such as cityscapes. Dark and damp street, at the usual time devoid of picturesqueness, can be transformed in the rain. Greyness disappears, the contours become more contrasting, and frames are not improved monotonous and sluggish.
It needs to be evaluated separately for the sunlight to light the sky and for the total light from the sun and sky.
Must take into account changes in the spectral composition at dawn, dusk and in cloudy weather. The spectrum and intensity also vary on the location of the object - the sun or in shade.
With clear skies, when dispersed in the atmosphere of blue-violet and ultraviolet light, shadow, illuminated with blue light. Cloudy, overcast completely dense clouds sky blue shade gives. With a low sun redness sunlight.
On the surface, lit by the sun, formed a series of light and shadow on the surface - the shadow series - their own and drop shadows that covered the sky and scattered light reflected from surrounding surfaces.
Surface in a number of lights always illuminated by direct sunlight and diffuse light of the sky.
When photographing on location should be taken into consideration in the shadow and light series, as the horizontal surfaces and shadows illuminated hemisphere of the sky, and the vertical surface - about half of the hemisphere.
Open the shadows are formed when shooting in an open area where the drop shadow figures and objects covered the entire hemisphere of the sky, so they are lighter than their own, lit by a quarter of a sphere.
Half-shadows are observed when recording of the buildings, a forest clearing, etc. In such cases, the sky near the horizon is covered with figures and their own shadows almost no coverage in the sky, and the flat surface of the highlights of his anti-aircraft part. The contrast of brightness in the light and shadow number increases significantly.