From: Milton Aupperle <milton@outcastsoft.com>

Date: April 9, 2009 5:17:06 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: USB to firewire?

Hi Tim;

One other issue your missing the fact that the cameras are usually all BUS Powered and this adapter delivers 4 pin mini FireWire. So even if you did connect it, there is no power on the FireWire bus.

USB 2 puts out maximum 500 mili amps, Firewire can run up to 40 volts and I think it's 8 amps maximum for the Spec, more than enough for a Camera and a TEC at the same tim (assuming the Mac / PC supported that much juice).

That's one of the reasons that PGR can't use much on USB because the bigger the CCD, the more power it draws. So you wind up with the camera needing to be powered externally for USB, adding even more wires to your Cameras.

From what I recall USB 3 delivers more power, but not 40 volts / 8 amps worth, so you'll always be powering the big CCD Cameras via a second power source.

HTH..

Milton Aupperle