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Thanks Marc, I think your barlow definitely works better than my GSO going by those great results you've been getting. I was looking at fused silica negative achromats to make my own but now I think I'll have a play with the TMB's spacing to get more amplification out of it first. That might be all that's needed, especially on the RC. The dob's infocus probably won't allow much of that. It's also why I wasn't able to use my de-windowed regular ASI120MM with the barlow. I was able to compare both cams at prime focus though, and found that with the AR window in place, required exposure times increased about 4-fold (!).
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