When using a prism or diagonal with an SCT, images are reversed left to right, but right side up - like looking in a mirror. If the telescope is pointing generally south (assuming you are in the northern hemisphere), and a star appears at the left edge in the field of
view (to your left), then the star is actually west of the telescopes position.

Mike

Ted Agos wrote:

> This may be a very DUMB question but in several articales I've seen on two star alignement there is no mention of the use of a prism
> with the eyepeace , The question is which way should the stars move __ when the telescope used with a prism is -to the EAST----to the WEST----and SOUTH on the meridian ???? What are the ERRORS indicated ( pointing east star moves up [north] telescope to high/to low )
>
> Ted Agos N1SBM

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