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Bart,
As you've probably already guessed, there's something wrong here...
You say:
I am unable to detect any stars in the field after it is set up. I can get Canopus on the chip and using the Bahtinov mask can get both cameras focused well and all works in harmony.
So you can get Canopus in both cameras? You should not be able to do this without re-setting the position of the mount.
The pick-off prism only sees the extreme outer edge of the field (hopefully just outside the imaging FOV...)
Have you tried during the day focused on a distant object?
The attached images are not mine, but show both the OAG set-up and the relative size and position of the guider image relative to the main image.
Hope this helps.
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