Figure 5.3. Image in telescope may be upside down or reversed left to right.
older types of telescopes. To know for certain which way a map is oriented, you need to know the directions of both north and east.
The diagonal in the Questar and Meade ETX is built-in. Newtonian and Schmidt-Newtonian reflectors don't include a diagonal; they give an inverted image. Image-erecting roof-prism diagonals are described on p. 92.
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