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ZOOM CONTROL All camcorders include electronic zoom buttons that offer veritable speed zoom adjustment while recording.  Most of these controls allow for desirable very slow zoom.  DSLRs zoom control is provided by a lens ring manual adjustment.  Very slow smooth zoom is nearly impossible to perform with this rotational adjustment. Even if the DSLR is rigged with a follow focus, ultra slow smooth zoom is very difficult.
CAMERA FUNCTIONS
CAMCORDER ELECTRONIC ZOOM CONTROL
DSLR MANUAL FOLLOW FOCUS AND RIG
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