Bruce Watson wrote:
One more vote for the Sigma 500 Super...bought two for the price of one Canon 550.
Perhaps at the time the Sigma was half the price of Canon's 550EX but currently, in the U.S., it's like 70% of the 550EX's cost. The Canon offers several custom functions not available with the Sigma. The Canon has a slightly higher GN. The Canon zooms to cover a slightly wider field than the Sigma. Sigma's 'save energy timeout mode' will not work when used in multi-flash setups, Canon's does. The 550EX accepts external high voltage packs, the Sigma does not. The build quality of the Canon is higher than that of the Sigma. These issues may, of course, not be of any importance to some but important to others. I'm speaking of the Sigma 500 Super DG here. The older non-DG model will not sync with all Canon digital cameras that use E-TTL.