Nikon SB-910 - Manual (Page 6)

A
Preparation
A–6
About the SB-910 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 fl ash photography functions with improved
communication between Nikon Speedlights and cameras
Illumination patterns
■
Control types of light falloff at edges; the SB-910 provides three illumination
patterns, standard, even and center-weighted.
■ 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 fl ash unit; GN = fl ash-to-subject distance
(m or ft) × aperture f-number (ISO 100)
Zoom head position
■
Position of a Speedlight zoom head; the angle of coverage changes as the zoom
head position changes.
■ Effective fl ash output distance
Flash-to-subject distance with correctly adjusted fl ash output
■ Effective fl ash output distance range
Range of effective fl ash output distance
Flash compensation
■
Intentional fl ash output change to obtain the desired subject brightness