Hi Marcel,
One more point, if you are getting an observatory and want to make the most of your money, it MAY be better to get a solid tube 10" or 12" dob as you can then install the tube onto a Equatorial mount like an EQ6 pro and have tracking for planetary or Deep Sky Pics later on. I dont think the collapsible ones will ever be able to be mounted like this (until some smartypants designs tube rings to handle a collapsible tube), so if this is the way you feel you might head when the funds come around after the observatory is built, then a solid tube is better value in the long run.
Something to consider.
Cheers
Chris
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