Odin makes lighting with Canon speedlites simple and reliable this blog site by Michael Zelbel has some answers.
“If you followed my photography tutorials for a while, then you know that I like to use TTL and that quite often I setup Canon ETTL lighting setups with the typical A:B lighting ratios. But now I got something better and I am just about to share it with you in a video.
My new radio flash trigger “Odin” allows me to use my Canon flashes together with my Canon camera in a much more simple, intuitive and reliable way than the Canon trigger or the master flash would do.
In many ways it’s similar to Nikon iTTL. So if in future videos I show you lighting setup which look like they are made with a Nikon system, then you know what’s going on.” If this is a subject area you are interested in go here and watch Michael’s video, most instructive
Here are some more links about the Phottix Odin
where to buy http://stores.ebay.co.uk/Dzone2-Digital-Shop/Phottix-/_i.html?_fsub=437716719
Canon Camera, Canon, Lighting, Michael Zelbel, Nikon, Odin, off camera flash, oxfordschoolofphotography.co.uk, Photographers Workshop, Photography, Phottix Odin, Through-the-lens metering, TTL