One way to do that, they knew, was to make the focal length of the eyepiece shorter ... Standing on shoulders Both types of telescopes—Galileo's refractor and Newton's reflector—underwent ...

The three main types of telescopes use lenses ... Magnification is determined by which eyepiece you use with any telescope.

This is deep-sky astrophotography made easy. However, its feature set ranks it a notch below the company's Odyssey Pro. Compared to its pricier sister, the Odyssey lacks a Nikon-m ...