best lenses for zooming on video??

does anyone knows what will be the best zoom lenses for making zoom on canon 7d or 550d?

I notice there's a change of light when zooming in the camera. i guess it would be from changing the focal lengt or anything.

I don't know if there's any kind of lenses that are better than other.

if anyone can help I'll appreaciate!!

1 Response

You need to buy a lens with constant aperture. For example the 24-70mm 2.8, 24-105 f4 or the 17-55 f2.8. These lenses have consistent aperture throughout the whole zoom so there wont be any change of light.

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