exposure lock trouble

Started Dec 21, 2010 | Discussions thread
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amresh New Member • Posts: 1
exposure lock trouble

i've tried shooting movies in ma 550d,with 18-55 lens, but i have trouble when it come to locking the exposure,exposure varies while zooming in or out even after hitting the ' * ' button before taking a shoot.

Even after switching to manual mode for movie, when i zoom in or out the shutter and aperture varies( even after hitting the lock key ( * ) )

So what i get in a zooming shot is that it switches from bright to dark. what should i do to overcome this?
pls help

firmware 1.0.9

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