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Reducing the length of my 18inch dobsonian?
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10-11-2017, 01:13 PM
billdan
(Bill)
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Join Date: Mar 2012
Location: Narangba, SE QLD
Posts: 1,551
Your right Raymo, I reread the blurb at the bottom , I guess for a DOB, the periscope could only be used with a Barlow to increase the focal length.
billdan
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