Hi there, thanks for the reply. I should have clarified I have the 600 flash as well. Today I bought a 110cm reflector also to get some good light on them so I'm looking forward to using it. I hadn't considered the macro for rings, thats actually a pretty good idea, and you just gave me a good idea for a shoot with it.

I might look into selling my 70-200 then buying the IS. This wedding will be outdoors so if its overcast etc the IS would come in handy with lowering shutter speed etc