Zoom lens 

The lazy man's dolly or tracking shot. Used effectively only in cases where speed is needed to grab the audiences' attention.

"We're losing light. Let's use a zoom lens instead of going through the difficulties of pre-planning and executing a superior tracking shot."

Zoom lens by creedmoor October 11, 2004

Zoom Lens 

a Zoom lens is a lens on a camera (still and video both) to get a closer shot of the subject. There are lenses that have both optical zoom and digital zoom capabilities (optical zoom being the better of the two)

"I have a Kodak camera with a 10x optical zoom lens"

Zoom Lens by DazzDeLaMorte March 11, 2007