Objective Lenses

Binocular and Spotting Scope Objective Lenses

The objective lens is the lens at the end of a binocular or spotting scope that is farthest from your eyes.

The objective lens determines how much light the binocular or spotting scope can receive and how bright the resulting image will be. The objective lens size also affects overall equipment size.

Binoculars

The second number (8 x 42) refers to the diameter of the objective lens in millimeters. Objective lenses typically vary in size from 15mm–80mm.

Spotting Scopes

The last number (20–60 x 80) refers to the diameter of the objective lens in millimeters. Objective lenses typically vary in size from 40mm–100mm.

Our Eagle Optics professionals are available to answer your questions at 1-800-289-1132 or info@eagleoptics.com.