I am currently using a Canon EOS550D with 18-55 lens and a 55-200 telephoto lens, a lot of my photos are taken at night in darkness or low light conditions. The built in flash on the 550D is not too bad for subjects that are close, however a lot of my subjects are a little timid and tend to be a little further away. I would like some advice on flashes that would be suitable for possibly using my telephoto lens with.