Edge numbers are reference numbers printed by light at regular intervals along the edge of 35mm and roll films during manufacture. Effective aperture is the diameter of the bundle of light rays striking the first lens element that actually pass through the lens at any given diaphragm setting. EIS stands for Electronic Image Stabilizer. A feature that minimizes effect of camera shake. Electroluminescence is the conversion of electric energy directly into visible light.
Electronic flash is artificial lighting produced by an electronic discharge in a gas filled tube.
A single tube can produce a large number of flashes. Electronic shutter is a shutter system timed by electronic rather than mechanical means. Electrophotography is the creation of images by alteration to the electrical properties of the sensitive material as a result of the action of light. Element is a single lens shaped piece of glass that forms part of a compound lens system. Elon is another term for Methylaminophenol sulfate.