Brush development is the method of development in which developer is applied to the material with a brush or similar instrument. BSI is an abbreviation for British Standards Institute. Buffer is a chemical substance used to maintain the alkalinity of a developing solution, particularly in the presence of bromine which is produced during development. Built-in meter is a a reflective light meter built directly into the camera so that exposures can be easily made for the cameras position. Bulb See B .
Bulk film is film purchased in long lengths.
Used in a bulk camera back or with a bulk film loader. Burning in See Printing-in . Butterfly lightning is lighting in which the main source of light is -placed high and directly in front of the subject.