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Nikki,
That’s very puzzling. I have a C5 and can focus both using an eyepiece in a star diagonal and with just the eyepiece. Furthermore, I have used a number of star diagonals with this scope and they have all worked.
Have U tried taking the star diagonal out from the scope and looking through it without an eyepiece? If everything can be seen clearly, then there should be no problem with the star diagonal.
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