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Introduction

Photography - Literally means "writing with light" and is generally accepted as referring to any procedure that permanently produces a visual image by the action of light.

Camera - a box with a hole in front that lets light in. The photographic emulsion [or film] that is put inside has a visual image recorded on it through the controlled presence of light rays.

Film - material used to capture the image. It is a light sensitive material and is sold for a wide variety of camera types and light conditions. It contains an emulsion layer of silver halide crystals. It cannot be exposed to light at any time except during the image exposure.

Developing process - the process by which the film goes through a sequential order of chemical solutions. This produces a series of negatives and are used with other chemicals, paper and equipment to produce the positive prints.