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Hi Alex, I have the 210. Getting to use it more and more now. I pulled it apart last night to see what's under the hood and fix a few issues I picked up at astrofest. It's a very similar design to an SCT. I flocked the tube as it was pretty bright in there and I had issues with alnitak off field while trying to image the HH. Also pinched optics on the secondary. Collimation screws were tight as and I had three spiked stars close to focus at high mag. Other than that it's built very nicely. The primary cell is a solid design with very minimal flop on the baffle tube. The secondary cell is well designed and I've had no dew issues to date on either. The primary does get dirty like any other open scope but nothing out of the ordinary. I don't know if it has an overcoat. The advantage of the Mewlon is that it's light weight compared to a similar FL SCT and significantly sharper as well. I attached a few shots showing the mechanics.
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