I just bought a 40d and this is my first ever SLR. Anyways, I thought I'd try a test shot. I allign the lens with red and turn it, it clicks. I set it to Auto. When I take a picture however, the flash opens and it flashes three times, or sometimes once. On the odd occasion I click the button it will take a picture but what's with the flash three times and shouldn't it be taking a picture EVERY time you click down? Thankyou.