Nikon Speedlight SB-700 - About the SB-700 and This User’s Manual; Terminology

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Preparation
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About the SB-700 and This User’s Manual
Terminology
Default settings: function and mode settings at the time of purchase
Nikon Creative Lighting System (CLS): a lighting system that enables various
 ash photography functions with improved communication between Nikon
Speedlights and cameras
Illumination patterns: control types of light falloff at edges; the SB-700 provides
three illumination patterns, standard, center-weighted and even.
FX format/DX format: Nikon digital SLR camera image area types (FX format:
36 × 24, DX format: 24 × 16)
Guide number (GN): the amount of light generated by a  ash unit; GN =  ash-
to-subject distance (m or ft.) × f-number of aperture (ISO 100)
Zoom head position: position of a Speedlight zoom head; the angle of coverage
changes as the zoom head position changes.
Effective  ash output distance:  ash-to-subject distance with correctly
adjusted  ash output
Effective  ash output distance range: range of effective  ash output distance
Flash compensation: intentional  ash output change to obtain the desired
subject brightness