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45 degree and 90 degree prism diagonals

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/09/2010 at 15:22
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Optics Apprentice
Optics Apprentice


Joined: February/05/2007
Status: Offline
Points: 85
Just picked up a used Meade ETX90 for cheap.  Its got two built-in viewing ports, one on top at a 90 degree angle to the main lens, and one at the front, in line with the main lens.
 
When i put an eyepiece in the upper port, the image is reversed, ie, in order to view something to the right, I have to move the scope to the left.  The image is backwards.
 
Will a standard 45 or 90 degree prism diagonal fix this?
 
Thanks.
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