Whilst clearing out the junk in my shed today, I came across a Cobra D400 flash unit. I am a total amateur when it comes to photography and having never used one of these units, I'm not sure where to start. When I connect the flash to my Canon 350d, the flash fires when I shoot (apparently this was a risk just connecting it and trying!) but there are loads of settings on the unit, and I have no idea what they all do. Can anyone enlighten me? or know where I might find the manual to download? many thanks.