I'm attempting to suss this out myself just now. Have to say, I'm still a little confused as to what might me best for me.
However...
as I understand it at the moment. If I have a 580EX MkII (which I do) I can buy the Canon transmitter for about £180.00 and retain all flash TTL functions. This seems like good value to me. You get a top of the range flash and a full monty wireless facility for around £500.00. A lot of dosh, but probably less than having to buy the flash guns and the Wizzards.
Still checking it all out so still not completely sure.
I think that's right.
If you want full auto TTL functions with remote flash, you need a commander unit on the camera or hard wired to it, that is an ST-E2 or 580EX/EXII gun which will fire any E-TTL compatible slave gun remotely.
That works tickety boo indoors and up to 10m or so outdoors with direct line of sight,
except in bright sun when it can be half that or less. Basically, range in daylight is the problem.
The only way around that is with a pair of radio Pocket Wizards - Mini TT1 transmitter which replaces the master flash unit, and a Flex TT5 transceiver attached to the remote gun. A bit over £400 for them, which have only just become available here for Canon with European operating frequencies. They can actually do more things than Canon gear, eg HyperSync and some other cool stuff. Nikon version is still in development.
Edit: I forgot the Radio Popper solution! Also new, bit of a hybrid radio-optical system, not so neat but seems to work well. Not sure about availability or price (maybe cheaper?) or about a UK/European spec version.
If anyone has the inside track on these things, please post
