eyepieces

Choosing eyepieces

Introduction

This page provides some assistance in selecting your eyepieces.

Basics

  • For a "complete" set of formulas and definitions, check the ATM telescope formulas page on this site.
  • Definitions
    • Aperture: opening of the telescope (diameter of the objective). SYMBOL: D
    • Focal length of the primary: SYMBOL F
    • f-number: SYMBOL: f/ = F / D
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