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I have an 8mm Stratus & 13 & 17mm Hyperion ep's, used previously in a 10" dob and now in my 12" and I don't get ghosting at all.
I'd be suspicious of external light sources in your observing environment reflecting off your own eye as well. I'd also make sure that your collimation is as good as you can get it, but I don't ever remember seeing ghosting even when my collimaion skills were less than perfect.
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