IMG_6083Although photography is ultimately about art, the use of high-tech gizmos inevitably leads to photographers throwing around an array of terms and acronyms that can be overwhelming to a new photographer.  This list is (obviously) a work-in-progress, but I hope it'll help a bit!

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Aperture -  The opening in a camera's lens. As this opening widens or narrows, it increases or decreases the light available to the camera, much as your eye's pupil as it reacts to changing light.
DSLR -  Digital Single Lens Reflex.
E-TTL -  Canon's proprietary implementation of TTL flash control.
Exposure -  See Learning | Exposure.
FEC -  Flash Exposure Compensation. Used in conjunction with TTL flash control to set the power output of an electronic flash. A typical FEC system lets you increase or decrease flash output relative to the metered "correct" setting by some amount.
Hotshoe -  A mounting plate generally found on the top of a camera designed to mount an electronic flash.
HSS -  High Speed Sync. Used in flash photography to indicate flash capability when shutter speeds are faster than sync speed. See also Intro to High Speed Sync.
i-TTL -  Nikon's proprietary implementation of TTL flash control.
OCF -  Off Camera Flash. A general term referring to the use of one or more flash units not mounted on the camera.
- Synonyms: off camera flash
Speedlite -  Canon's brand name for their electronic flash units. Both "speedlight" (Nikon's brand name) and "speedlite" have become somewhat genericized to refer to any brand of portable, battery-powered electronic flash.
- Synonyms: Speedlight, electronic flash
Strobe -  An external lighting system designed to work by providing a brief flash of light. Unlike portable electronic flashes, these are typically larger, wall-pluggable lighting systems designed for use in studio settings.
- Synonyms: studio strobe
Sync speed -  The fastest shutter speed at which a single flash of light can illuminate the entire focal plane of a camera. See also Intro to High Speed Sync.
TTL -  Through The Lens. This typically refers to the ability of a camera to perform operations such as metering using the lens actually mounted to the camera at the time rather than using a secondary lens or sensor to accomplish these things.
TTL flash control -  A system of connecting a camera to one or more electronic flashes so that the camera's exposure metering and controls can be applied to control the power output of the flashes.