All telescopes, refractors, reflectors, and catadioptrics, as well as all cameras, have inverted images because that's the way all lenses and mirrors work. ... Refractor and Cassegrain telescopes will produce an image that is upside-down when used without a diagonal.

How do you fix an inverted image in a telescope?

One of the biggest surprises that beginner astronomers have is when they find that the view they are seeing through their telescope is upside down or backward. To correct upside-down viewing equipment known as a Diagonal can correct the image and turn it right-side up.

Why is my reflector telescope image upside down?

The difference in orientation is a consequence of how the light is brought to focus by each scope design. Generally, if your telescope has an even number of optical elements – such as a Newtonian reflector with its two mirrors – your object will appear upside down.