Looking through a telescope introduces you to a whole new world of unexpected wonders. But telescopes come in a huge range of sizes and shapes. Here's a detailed, printable guide to the essential features that every good scope needs to have.
Sky & Telescope has reviewed innumerable telescopes, and only a handful of the ones that we've tried and liked cost less than $200. Now we're going to recommend a telescope that's selling for $20, and your response is going to be "you're kidding, right?" No, we're not!
Here are common questions about telescopes culled from an expert’s mailbag.
Optical aberrations limit the performance of an eyepiece. Here are seven common problems, with solutions where applicable.