Understanding Optics
- 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
- Eye Relief and Eyecup Design
- Exit Pupil
- Close Focus
