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I have a Firewire camcorder mounted on a Ninja which has also got two power supplies (one for the camcorder, one for the Ninja).
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Typically a device can pull about 7 to 8 watts from the port; however, the voltage varies significantly from different devices. Voltage is specified as unregulated and should nominally be about 25 volts (range 24 to 30).<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
So today's question is... will the Firewire bus have enough power for the camera and to move the Ninja pan/tilt? We'll see [:p]

Steve

Not if your computer is offering the small 4-pin FireWire connector because that type of connector is not carrying any power. If your computer is offering the bigger 6-pin connector it may be possible, depending on the power demands of both devices.

Though I wouldn't tinker with it: The voltage offered is unragulated and can be anything from as low as 9v up to 30v and higher.

It's proper 6-pin. I'll watch the voltage carefully as I slowly draw more current from it. I think it's unlikely to be enough, but I'll let you know!
Cheers, Steve

In my case the Firewire power seems to come directly from the PC's regulated 12V line. All I've needed is a little 12 -> 8.4 voltage regulator to power the camera and everything is fine. Now there's only one line to the ninja+camera rather than three, although I made a bit of a mess of the Ninja putting two Firewire sockets into it. So it can be done, but as you say the voltage is not guaranteed to be anything other than 9v - 30v unregulated so check this first!
Steve