Understanding Binocular Magnification and Objective Lens Size
← Camping Essentials & Setup | Essential Tools & Safety Quick answer The first number on binoculars is magnification (e.g., 8x). It tells you how much closer an object appears. The second number is the objective lens diameter in millimeters (e.g., 42mm). Bigger lenses gather more light. For general birding or hiking, 8×42 or 10×42…