Ok so heres whats going on.. I have a new t2i canon dslr and i got it for the movie mode.. I love it but one thing i dont get is when i zoom in the shutter keeps adjusting and you can tell on the video when i zoom in it goes from dark to light exposure even if i have everything in manual mode which i always do cuz i love to be in control.. any help I would apreciate.. Thank you in advance!!