Can you power the Sigma from a Quantum unit? If not what is the advantage of it over the 420ex that is the same price point and is Canon made?
I was comparing prices at B&H web site. Harrison McClary http://www.mcclary.net * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
