zoom lens

The camera dollied backward along the length of the tower's staircase while simultaneously its lens zoomed forward.

If you zoom in on Google Maps, you can just make out the jumbles of industrial machinery tucked away inside.

I see my personal experiences as a lens to look at something much bigger.

Go carefully over the film with an oil-immersion lens, using a mechanical stage if available.

Still kneeling, he drew from his waistcoat pocket a powerful lens contained in a washleather bag.

By far the greatest of these scientific inventions are those which depend upon the lens.

It was a little longer than the usual three cell case, and there was a finely ground lens at the end.

He removed his glasses and wiped them slowly and carefully, polishing each lens with meticulous care.