Q. How do I determine the magnification of my telescope?
A. The magnification of any telescope is controlled by the eyepiece being used and can be calculated by dividing the focal length of the telescope by the focal length of the eyepiece. For example; for Meade’s ETX80 Observer which has a 400mm focal length, with the included 26mm and 9.7mm eyepieces, magnification would be 15X power using the 26mm eyepiece (400/26) or 41X power with the 9.7 eyepiece (400/9.7). Most telescopes, including yours, have interchangeable eyepieces so the telescope can be used at low, medium, or high magnification.