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Originally Posted by venus
thanks, that probably explains it mine is
EF 28-135mm f/3.5-5.6 IS USM
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One way to stop this problem for you would be to set the aperture to 5.6 minimum, then the exposure would remain the same throughout the zoom. I assume you are using some other mode than manual, though? Program?
Try putting the camera in aperture mode, but be careful, if the light gets too low you will slow down the shutter some and may get some blur due to camera movement (unless your on a tripod)