sony pd 150/170 video cameras
Most digital video cameras have a rocker switch button you can press to zoom in for a close up shot or zoom out for a wide-angle view.
On the Sony TRV900, PD150 and PD170, the rocker switch zoom button is on the top back of the camera on the right.
Press on the end marked T (for telephoto) to zoom in, or on the end marked W (for wide angle) to zoom out.
Experiment with the zoom button before you start filming. Depending on the camera, you can usually zoom in and out with varying speeds, and this takes a little practice to master!