As far as I am aware the Canons only work properly with Speedlite range of flashes, other generic or older flash units will only go up to a maximum of 1/200 shutter with poor flash performance. I could be wrong here, but I do think if you want a good flash, you either have to spend hundreds on a flash gun or lots of hundreds on a remote flash trigger. I looked into this for my 400D, I decided to shoot in daylight LOL
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