Hi So I have a canon 400d and a 380EX speedlight, which should work fine together, no? I find that I can't seem to get any good photos with the flash though - if I use it on Av mode in lowish light it still chooses a long exposure time. It seems like it doesn't want to use enough flash power - it never flashes anywhere near as bright as if I push the test button on the speedlight. Am I missing something here? Another part of the problem (though not the main part) is that it wont choose the right zoom level due to the crop body sensor - is this going to make a big difference?