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Terminology, About the sb-500 and this user’s manual – Nikon SB-500 AF Speedlight User Manual

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Preparation

About the SB-500 and This User’s Manual

Terminology

Nikon Creative Lighting System ( CLS):

a lighting system that

enables flash photography functions listed below with improved
communication between Nikon Speedlights and cameras
i-TTL flash control/Advanced Wireless Lighting/Modeling flash/
FV lock/Flash (LED Light) Color Information Communication/
Auto FP high-speed sync

Guide number (GN):

the amount of light generated by a flash

unit; GN = flash-to-subject distance (m

Ɓ

or

Ɓ

ft) × aperture f-number

(ISO 100)

Effective flash output distance:

flash-to-subject distance with

correctly adjusted flash output

Effective flash output distance range:

range of effective flash

output distance

Flash exposure compensation:

intentional flash output change

to obtain the desired subject brightness

i-TTL flash control:

flash control mode in which the Speedlight

fires monitor pre-flashes and the camera measures the reflected
light and controls the Speedlight flash output

Monitor pre-flashes:

a series of flashes emitted for a very

short time before the actual firing that enables the camera to
measure the light reflected on a subject