The Vivitar 18-52x80 MV-1852 Binocular, based on the BK 7 porro prism design, offers variable magnification factors from 18x up to 52x for extreme close-up observation. Linear fields-of-view (@1000 yard/914.4m) vary from 132' (40.2m) at 18x zoom to 42' (12.8m) at 52x magnification.
The diopter adjustment feature offers visual correction for an optimal view, and the center wheel focus design simplifies focus adjustment. The multicoated high-definition lenses of the binocular ensure sharp image reproduction. Exit pupil diameter varies from 4.4mm at 18x to 1.5m at 52x magnification.