as well as a Bulb setting for longer exposures. The x-sync speed for flash photography is 1/180 second. A fully automatic mode called Intelligent Auto (iA) enables Scene Detection, and places the ...
Flash photography has been a particular strength of Nikon SLRs for some time now, and the D3100 follows suit, with its implementation of Nikon's 3D Color Matrix II metering for flash exposures.