If the spec sheet and PR write-up are anything to go by, the new Nikon D3100, despite its “entry level” tag, is Nikon’s most capable DSLR video shooters to date with the incorporation of full time AF for video shooting in Live View.
Nikon says, “Using contrast based AF, the D3100 automatically focuses on subjects when Live View is activated to aid shooting when using the LCD.”
It also also uses Face Detection technology to lock focus on up to 35 human faces in video shooting, dedicated Live View switch, dedicated HD video button. Sample video below:

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can’t wait to get it, just ordered it from Amazon. I am sure this baby will handle my led lights picture very nicely.