Wireless TTL multi-flash functionality is only part of the story though, as the SB-900 offers a range of new features as well. Here's a list, compiled from Nikon's marketing materials: Streamlined ...
Flash photography has been a particular strength of Nikon SLRs for some time now, and the D3200 follows suit, with its implementation of Nikon's 3D Color Matrix II metering for flash exposures.