Understanding Optics

EO Optic Guide

Learn more about optics and what we offer our customers.

» Download Guide (3MB)

• Glass Quality
• Lens Coatings
• Magnification: article | video
• Objective Lenses: article | video
• Porro and Roof Prisms
• Phase Correction
• Waterproofing and Fogproofing
• Interpupilary Distance
• Field of View
• Understanding Eye Relief: The Basics | A Closer Look
• Exit Pupil
• Close Focus

• Binocular Fit And Focus
• Upgrading Your Binoculars
• Choosing an Angled or Straight Spotting Scope