From magnification to light-gathering, here’s how to make the decision between buying a telescope or a monocular for ...

It may here be remarked that the ordinary terrestrial telescope with erecting eyepiece is nothing more ... though of only 51/2 in. focal length, instead of the usual 8 or 9 in., ...

Because his telescope offered a much greater field of view, astronomers had plenty of room to improve magnification. One way to do that, they knew, was to make the focal length of the eyepiece ...

If so, just multiply the inches by 25.4. To find magnification, simply divide the telescope's focal length (f o) by the eyepiece's focal length (f e). For example, if your telescope has a focal ...

View the planets and night skies from home - Heavens above! Your guide to the best telescopes for stargazing, created for all ...