User:Odosuiadan/Nikon CLS

Nikon CLS Stands for Creative light system.

The term CLS is a marketing nave that covers some Nikon products with the ability to work together in order take control of the light of a scene.

How CLS works
Them minimal Nikon Cls system consists on one camera, one master unit and one slave unit. in this combination, when you take a picture the camera (with the master unit) will send some comunication signals [using light pulses] to the slave units, makint it posible to have remote i-ttl capable flash units.

The Master Unit
The master unit is directly atached to the camera and is the comunication poit vetween camera and the slave units. Some diferent devices can work as master units like the Su600 or the flash units SB800 and SB900 as some cameras has build in master units like the D90. Cls can work on 4 different channels so the master and the slaves must be configurated on the same channel so as in each channel there are some groups (the amount deppends on the master unit) to separate diferent slave units into groups. each group can have a different configuration wich is changable directly from the master unit without having to go directly to every flash. The modes are: Off, Manual, Tll (with -3 to +3 ev compensation) and A.

The Slave Units
The slave units or slave flashes will recive the information from the master in a short preflash and then react folowing the orders of the given channel and group they are.

Auto FP
Auto FP High Speed Sync, is a extra mode that can be enabled on the camera and is compatible with CLS that will alow you to use flash light veyond the normal 1/200 - 1/250 exposure times letting you take pictures up to 1/4000