>> Putting prices aside, would there be any reason why i would NOT want >> to buy the 550 ?
1) If you shoot a lot of macro photography, perhaps an MR-14Ex or an MT-24EX would be better. 2) If you shoot 2nd curtain sync, the 420EX is easier to use than the 550EX. The Sigma EF 500 Super drops out of 2nd curtain as soon as the shutter speed drops below X-Sync, and the setting has to be reapplied. 3) If you ever need a wireless slave flash, choose the Sigma EF 500 Super. The 550EX (and 420EX) need an additional optical slave trigger hotshoe accessory. 4) If you intend to build a wireless E-TTL system, you should choose one 550EX as the master unit. It has functions that are not currently available on any other flash. A few of us at EOSDOC are thrashing out the guts of a new document showing the detailed differences between the various E-TTL flash units. Note that Dave Herzstein (thanks Dave) just e-mailed me some notes about the ST-E2 that have not yet made it into the draft: http://eosdoc.com/manuals.asp?q=ETTLDx Cheers Julian Loke * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
