Telescopes: Guides & Recommendations

Optical Aberrations at the Telescope — And How to Avoid Them

Optical aberrations limit the performance of an eyepiece. Here are seven common problems, with solutions where applicable.

Magnifying Lens

Choosing Your Astronomy Equipment

Common Telescope Magnification Myths

Answers to some of the most common misconceptions about telescope magnification.

Apparent Fields

Choosing Your Astronomy Equipment

How to Choose Your Telescope Magnification

How high can you get? How low can you go? The answers depend on many factors that combine to give each telescope a useful magnitude range.