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Understanding Depth of Field in Photography. Depth of field refers to the range of distance that appears acceptably sharp.
It varies depending on camera type, aperture and focusing distance, although print size and viewing distance can also influence our perception of depth of field. This tutorial is designed to give a better intuitive and technical understanding for photography, and provides a depth of field calculator to show how it varies with your camera settings. The depth of field does not abruptly change from sharp to unsharp, but instead occurs as a gradual transition. In fact, everything immediately in front of or in back of the focusing distance begins to lose sharpness — even if this is not perceived by our eyes or by the resolution of the camera. Since there is no critical point of transition, a more rigorous term called the "circle of confusion" is used to define how much a point needs to be blurred in order to be perceived as unsharp. In Focus - National Geographic Photo Contest 2011. National Geographic is currently holding its annual photo contest, with the deadline for submissions coming up on November 30.
For the past nine weeks, the society has been gathering and presenting galleries of submissions, encouraging readers to vote for them as well. National Geographic was kind enough to let me choose among its entries from 2011 for display here on In Focus. Gathered below are 45 images from the three categories of People, Places, and Nature, with captions written by the individual photographers. [45 photos] 99 Excellent Examples of Forced Perspective Photography. Forced perspective is a technique that employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is.
It is used primarily in photography, filmmaking and architecture. It manipulates human visual perception through the use of scaled objects and the correlation between them and the vantage point of the spectator or camera. There are many ways to attack photography and some are much more expensive than others.