Vivitar VIV-DF-186 Manual Do Utilizador

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The Green Auto Check Light (OK) located on the back of the flash is used to confirm that 

In order to save battery life,  your flash will automatically turn off if left idle for more than one

minute.

your subject is within the effective TTL range of the flash unit. If your subject is within the 

effective TTL flash range after shooting, the green Auto Check Light will illuminate for 

approximately 2 seconds.