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Nearly every landscape shot includes a piece of the sky. So do many portraits. The sky is something that is with us every day. It is the source of daylight, it is the source of clouds and it is the ultimate azure. It is the bed of the Sun, the Moon and the Stars. It is also the canvas upon which the most beautiful sight you can see is painted: the sunset.
The sky makes a marvelous backdrop for any subject. A deep textureless summer azure will perfectly compliment any building, animal, person, vegetable or thing, since virtually nothing in this world resembles the sky. Partial or complete cloud also make an excellent backdrop. But the sky can also be a subject all on its own as these pictures demonstrate.
The sky can be a difficult subject to photograph due to the potential for excessive dynamic range. The sun is the brightest thing that is naturally occurring and anything that is photographed near it will be so much darker as to appear virtually black, that is except at sunset, where the sun's brightness is weakened by its oblique angle to the atmosphere. Similarly, the sun's reflection off a cloud is still very bright and will make the dark parts of a cloud appear too dull. The human eye can deal with this enormous dynamic range, seeing both the detail in the bright and dark patches, but the camera and the display screen cannot. The photographer can expose for the brights or darks but not for both. The effect of this is that sunsets and dark clouds don't usually do justice to the original scene. There are occasional exceptions but these are rare, and kudos the photographer who captures them!