Two factors determine the true field: the telescope's focal length and the diameter of ... What's more, the magnification through both eyepieces will be the same. Most observers prefer a wider ...

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 ...

Here, Galileo took this crude device with a magnification ... by making lenses with longer focal length, resulting in monsters like Hevelius's 45-metre-long telescope in Danzig.

Looking for a telescope for the lunar eclipse ... You can also use a tele-extender (based on the magnification factor) up to two times (2x) the lens' focal length. The only caveat with this ...

The best telescopes allow you to observe the night sky in more detail. The best telescopes unlock the wonders of the night sky right from your backyard and beyond. Bring the Moon and planets into ...