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Aaron
I have a 178MC and have good results using 2x barlow. I just put it straight in the barlow. For 4x I have just stacked two barlows.
Have another try without that spacing.
All I can see in the ZWO specs is the back space of 12.5mm for my camera.
From the pic it looks like your camera chip is about 30mm from the barlow aperture. This doesnt make sense to me... maybe I'm missing something?
I have seen no diagram that suggests this spacing, so it might be THE problem.
Cheers
GlennB
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