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out of focus concentric diffraction circles
Doing a star test on my dob, and the shape of the out of focus circle looks good everything concentric, the only thing is I can't make out each individual concentric circle, its as if they are all blurred together.
With my tiny cheap refractor the concentric circles are quite clear, but I cant make out each individual one in my 8 inch dob.
Possibly they are so close together they are all blending together.
Is there something wrong with the dob?
Hope I'm making sense.
Mike.
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