The Essential Guide to Astronomy
Choosing Your Astronomy Equipment
Optical aberrations limit the performance of an eyepiece. Here are seven common problems, with solutions where applicable.
By: Al Nagler
July 17, 2006
Telescopes: Guides & Recommendations
Answers to some of the most common misconceptions about 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.