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Digital Photography Glossary

Photography Glossary - E

Understand the terminology of digital photography, digital printing and digital imaging so that you will become a better photographer. Photographic terms such as Exposure, Exif, Exposure Compensation, Exposure Meter, and more.

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EFL

EFL stands for Equivalent Focal Length. Due to the smaller size of most digital camera image sensors, there is a magnification factor when using a 35mm film lens. A focal length approximation must be made to understand the new, relative focal length of the lens when being used on a DSLR.

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E-TTL

E-TTL (Evalulative-Through-The-Lens Metering) is a flash metering systems designed by Canon, in which the flash unit fires a pre-flash burst prior to the main flash firing in order to get a more accurate metering reading for a more correct exposure.

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EV - Exposure Value

EV (exposure value) is an expression of all the possible shutter speed, film/image sensor sensitivity (ISO) and aperture value combinations to acquire the same exposure.

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EXIF

EXIF stands for EXchangeable Image File Format. It is the file formats used by digital cameras and includes JPEG, TIFF and RIFF WAV. Does not support JPEG 2000, GIF or PNG. EXIF is able to contain the following metadata: date & time information, image orientation, aperture, shutter speed, focal length, metering mode, and ISO rating, thumbnail previewing info and copyright information.

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Exposure

The Exposure Triangle

Exposure is the physical combination of shutter speed, aperture size and ISO rating that determines how much light the image sensor (or film frame) records. When these three elements are combined, they represent a given exposure value (EV) for a given setting. Any change in any one of the three elements will have a measurable and specific impact on how the remaining two elements react to expose the film frame or image sensor and how the image ultimately looks.

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Exposure Compensation

Exposure Compensation is the ability to automatically adjust the calculated exposure, as indicated by a metering reading, when it might yield a less-than-optimal result and to compensate for the adverse elements.

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Exposure Latitude

Exposure Latitude is the distance, measured in f-stops, between the lightest light and the darkest dark within an image. Exposure Latitude helps give specificity to a digital camera's (or film stock's) ability to render the subject effectively with discernible highlights and shadow detail.

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Exposure Meter

Hand Held Light Meters

An Exposure Meter is a photo-sensitive device that measures the relative light source on a given subject by quantifying it in specific photographic expressions (foot candles, f-stops, etc.)

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