base magnification

base magnification

[′bās ‚mag·nə·fə′kā·shən]

(optics)

The ratio of the distance between the centers of the objectives of a pair of binoculars to the distance between the centers of the eyepieces.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.