Binoculars.org

Zoom Binoculars

Zoom binoculars have a major advantage over standard binoculars, the ability to change or modify the magnification, however there are some disadvantages you need to understand when selecting a zoom binocular. For example, a 10×50 binocular has 10x magnification with a 50mm objective lens.  It’s exit pupil is measured at 5mm.  With the nice large 50mm objective [...]