Blur is unsharp image areas, created or caused by subject or camera movement, or by selective or inaccurate focusing. Boom is an adjustable metal arm, attached to a firm stand, on which lighting can be mounted. Some booms are also made to support cameras. Borax is a mild alkali used in fine grain developing solutions to speed up the action of the solution. Border is the edge of a photographic print - either left white, or printed black.
Boric acid is a compound used in certain fixers to prolong shier hardening life.
Bounce light is a light that is directed away from the subject toward a reflective surface. Box camera is the simplest type of camera manufactured, and first introduced by George Eastman in 1888. It consists of a simple, single element lens, a light tight box and a place for film in the back. Bracketing is the technique of shooting a number of pictures of the same subject and viewpoint at different levels of exposure. Brady, Matthew 1823-1896.