The aperture is an adjustable hole created by a diaphragm in the lens through which light passes to form an image.
field is concerned with producing images of buildings and
Some buildings are photographed solely because they have been designed with such skill and aesthetic beauty that they warrant being named works of art.
Other buildings, or portions of them, are shot for other reasons, such as real estate sales, or for use by the architect or designer.
Most of this work is done with large format cameras to control the lines of convergence caused by the angle by which a structure is viewed.
Without the aid of the tilts and shifts of a large format camera, or the use of a special "shift lens", the walls of buildings when viewed from the ground will appear to converge, or move closer together at the top of the structure.
The tilting and shifting ability of cameras and lenses corrects this optical effect to make walls appear straight in the image.
The clients who commission these
photographs may be the owners of the buildings or the architects or
designers who have worked on them.
If the designer or architect has hired the photographer, he or she may come on the shoot to guide the photographer to the areas of importance; otherwise, architectural photographers often work on their own.