Question about Edu-Science (10166) Telescope
Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear.
It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one. It sounds like you have a partially erecting diagonal fitted- it is flipping the image upright but giving a mirror image side to side.
If you wish to use a telescope for terrestrial objects then you will be better off with a "spotting scope" which is designed to present the image in the orientation you expect.
Posted on Dec 30, 2010
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Posted on Jan 02, 2017
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