Emerson, Peter Henry 1856-1936. Emulsion is a light sensitive material which consists of a suspension of silver halides in gelatin. Emulsion side is the side of the film coated with emulsion. Endoscope is an optical device allowing the viewing and photography of small inaccessible subjects. Enhanced back printing in an Advanced Photo System feature available in some cameras that enables users to encode detailed information at the time of picture-taking.
Enlargement is a term used to describe a print larger than the negative used to produce it.
Enlarger is an apparatus for producing prints by projecting a negative or transparency on sensitive paper. Enprint is a small enlarged print, with dimensions of a fixed ration, produced commercially in an automatic printer. Entrance pupil is the size of the beam of light which, entering the elements of a compound lens that are in front of the aperture, completely fills the iris diaphragm . Equivalent focal length is the distance in a lens between the front nodal point and the focal plane when the lens is set to focus a subject at infinity. In a telephoto lens the equivalent focal length is shorter than the back focus.