Photography glossary - E

E6 - Standard chemical process for developing
slide films.

Easel - device to hold photographic paper flat during exposure,
usually equipped with an adjustable metal mask for framing.

Eberhard effect - border effect occurring in a developed image. It
appears as a dense line along an edge of high density and as a
light line along an edge of low density. It occurs most often in
plates developed flat in solution that is not sufficiently agitated. The
effect was described by Gistav Eberhard in 1926.

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Edge numbers - reference numbers printed by light at regular
intervals along the edge of 35mm and roll films during
manufacture.

Effective aperture - diameter of the bundle of light rays striking
the first lens element that actually pass through the lens at any
given diaphragm setting.

EIS - Electronic Image Stabilizer. A feature that minimizes effect of
camera shake.

Electroluminescence - conversion of electric energy directly into
visible light.

Electronic submission- submission of material through e-mail or other electronic means.

Electronic flash - artificial lighting produced by an electronic
discharge in a gas filled tube. A single tube can produce a large
number of flashes.

Electronic shutter - shutter system timed by electronic rather
than mechanical means.

Electrophotography - creation of images by alteration to the
electrical properties of the sensitive material as a result of the
action of light.

Element - single lens shaped piece of glass that forms part of a
compound lens system.

Elon - another term for Methylaminophenol sulfate. It is more
commonly known as metol.

Email - A world-wide electronic mail system. Digitised data can be sent almost immediately throughout the world via telephone lines using only a PC. Every email user has his or her own internationally distinct address where he or she can be reached electronically. Files, such as digital pictures, can be sent with any email message.

Emulsion - light sensitive layer of film or paper.

Emulsion side - side of the film coated with emulsion.

Endoscope - optical device allowing the viewing and photography
of small inaccessible subjects.

Enhanced back printing - Advanced Photo System feature
available in some cameras that enables users to encode detailed
information at the time of picture-taking.

Enlargement - term used to describe a print larger than the
negative used to produce it.

Enlargement ratio - ratio denoting the amount of linear (not area)
enlargement between a print and the negative from which it is
made.

Enlarger - apparatus for producing prints by projecting a negative
or transparency on sensitive paper.

Enprint - small enlarged print, with dimensions of a fixed ration,
produced commercially in an automatic printer. Usually 3 1⁄2" wide.

Entrance pupil - 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.

EPP (Enhanced Parallel Port) A high-speed, bi-directional printer port on modern computers used by some digital cameras and scanners.

EPSv - Encapsulated PostScript. A computer file format based on the PostScript standard. It is supported by most graphic design and page layout programs. In addition to the PostScript code, the EPS

Equivalent focal length - 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. The reverse is true in a wide angle
lens.

Etch - process of removing small imperfections in a print or
negative by scraping away part of the emulsion.

E-TTL (Evaluative-Through The Lens) An exposure system that uses a brief pre-flash before the main flash
to calculate the exposure index (used by Canon®).

Etching - dissolving away selected areas of a surface while
shielding the other portions with a resistant. The process is used as
a creative drawing medium as well as for making half-tone plates
on copper or zinc.

Ever-ready case - camera case that can be opened, allowing the
camera to be used without removing it. A front flap hinges down to
uncover the lens, viewfinder and camera controls.

Everset shutter - simple camera shutter mechanism on which a
single depression of the release both tensions and fires the
shutter.

Exif - Exchangeable image file. A standard created by JEIDA to store valuable information about an image including capture information, camera info, capture time and anything else you can imagine for image files created with digital cameras and other input devices. Exif files contain many comment fields of various types. The EXIF is stored within the image file.

Exit pupil - image of the iris diaphragm formed on the back
surface of a compound lens by the elements behind the aperture.

Exclusive property rights. A type of exclusive rights in which the client owns the physical image such as print or slide. Good example is a portrait.

Exclusive rights. A type of rights where the client buys exclusive usage of an image for negotiated time period.

Expiry date - date stamp on most film boxes indicating the useful
life of the material in terms of maintaining its published speed and
contrast.

Exposure - The length of time for which the shutter is open. Product of the intensity of light and the time the light is allowed to act on the emulsion /censor (I x T = E). Exposure is controlled by a combination of the lens aperture and shutter speed.

Export To print - compress or save a data file using a particular file format or function.

Exposure time - See above

Exposure index - see Speed.

Exposure latitude - amount by which it is possible to over or
underexpose a light sensitive material and, with standard
processing, still produce acceptable results.

Exposure meter - instrument for measuring the amount of light
falling on or being reflected by a subject.

Exposure value (EV) - scale of values used to indicate the
sensitivity range of a TTL or off-camera meter system within which accurate exposure measurement is guaranteed.

Exposure correction (compensation/ control) Conscious deviation from the value ascertained by the light meter. The change can be made manually (under and over exposure) or through programmed auto exposure control.

Explorer - Microsoft internet-browser.

External flash – A supplementary flash unit that connects to the camera with a cable, or is triggered by the light from the camera''''''''''''''''s internal flash. Many fun and creative effects can be created with external flash.

Extension - Hardware or software module that adds new functions to an existing system.

Extension bellows - device used to provide the additional
separation between lens and film required for close-up
photography.

Extension tubes - metal or plastic tubes used on small format
cameras, to extend lens-to-film distance, enabling magnification
greater than 1x.

Extinction meter - early type of exposure calculator.

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