a 20mm 2″ eyepiece will show more sky than a 20mm 1¼” eyepiece through the same telescope. What's more, the magnification through both eyepieces will be the same. Most observers prefer a ...

According to Dr Brown, a 700mm focal length telescope and a 10mm eyepiece can completely fill your view with the Moon. Magnification levels that are too high can harm your experience, as you'll have a ...

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 ...