(Interesting aside: Since the magnification also depends on the telescope's focal length, note that each eyepiece will have a different magnification depending on the telescope it is in.)īefore you go buying any extra eyepieces, though, I'd strongly recommend you go see what you can see with the equipment you already have! You should certainly be able to see Jupiter, Saturn, and Mars. To get a 65x magnification, you'd need somewhere around a 6.2mm eyepiece. If you tried an 8mm eyepiece, you'd get a 50x magnification. Total magnification is the focal length of the telescope divided by the focal length of the eyepiece.Ĥ00mm (telescope focal length) / 20mm (eyepiece focal length) = 20x magnificationĤ00mm (telescope focal length) / 10mm (eyepiece focal length) = 40x magnificationĪs you can see, the smaller the eyepiece focal length, the greater the final magnification. There is another stat that is important to figuring out what eyepieces are likely to show you, though, and that is the telescope's focal length. This is the main thing that dictates how bright of an object you can hope to see at the eyepiece. Every increase in magnification is zooming in on a smaller and smaller area, which means it is looking at a smaller and smaller fraction of the original amount of light. The telescope is only collecting so much light. But in practice, its magnifying power is limited by the amount of light the telescope is taking in, which is to say, its aperture. Even then the image at the eyepiece is going to be dim at that magnification.Īny telescope can in theory achieve an unlimited magnification. clear atmospheric conditions, dark skies with no light pollution, viewing on a night with a new moon, etc). However, you are unlikely to find that much magnification to be usable except under very ideal conditions ("good seeing" i.e.
The highest useful magnification of the Celestron Travel Scope 70 is about 165x.
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