Yes, the SB-600 can be used as a slave using i-TTL wireless control from the D3200.
If you set the Flash control to TTL when the SB-600 is connected, then standard i-TTL flash control will be used with spot metering or when selected with the SB-600 flash unit.
Hi, sorry I haven't been notified of your previous replies.
I will opt out so another expert can assist you more quickly.
Hi, you are 100% correct, different expert here.
The unit needs something to provide the pulse that will set off the flash system.
If you need anything else on this please reply to me.
Have a great day ;-)