Introduction

Buying your first telescope is exciting, but it can also be overwhelming. Walk into any astronomy retailer (or browse online for five minutes) and you’ll encounter a wall of unfamiliar terms — refractors, reflectors, Dobsonians, alt-az mounts, focal ratios, Barlow lenses — and prices ranging from $50 to $5,000. It’s a lot.

This guide is here to help. We’ll walk you through what you actually need to know before spending a dollar, in plain language, in a logical order. By the end, you’ll understand what the different types of telescopes are, what they’re good at, what accessories matter, and how to make a smart first purchase — new or used.

A few things to keep in mind as you read:

• There is no perfect telescope. Every design involves tradeoffs. We’ll help you understand them so you can decide what matters most to you.
• Aperture is king. The single most important spec on any telescope is the diameter of its main optical element. More on that in the next section.
• The best telescope is the one you’ll actually use. A big, complicated scope that sits in a closet is worth less than a modest one that comes out every clear night.

Use the navigation above to work through the guide at your own pace, or jump to whatever section interests you most.