I'm a beginner to the world of SLR camera's etc...however I'm very serious about learning. I've got a Rebel Ti and in the future I'd like to get into some small time portrait shooting (maining out doors so studio lighting probably won't be a factor)...probably senior pictures type stuff. I've been looking into getting a nice cannon flash. What are the basics of picking out a good flash? More specifically, what are the differences between the cannon 420 and 550 (those numbers may not be correct but I'm sure you know which two i'm talking about) other than the 550 costing twice as much? Is it really worth twice the money as the 420? Keep in mind I'm not going to be shooting from huge distances (but I'd still like some flexability). Any and all advice would be GREATLY appreciated. Thanks a million,
Justin