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Please tell us a little more about your reflector - make, model, aperture, focal length?
I would suspect that a 4mm plossl is pushing the scope beyond its limits to produce an acceptable image? I found that a 6mm plossl was too much for an 8" reflector - as well as the eye relief being way too small.
Are you clearly not getting down to the smallest image? Or are you going through the smallest image but its still a fuzzy blob at that point?
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