Metz mecablitz 52 AF-1 Mode D'emploi page 150

☞ In slave-/ servo mode, the automatic cut-off
is not activated.
The flash unit should always be turned off
using the main switch
k
to be used for an extended period.
m/ft
STANDBY
MOD.LIGHT
if it is not going
Off
Setting the automatic unit switch-off
OPTION
STANDBY