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Tube Length?

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Posted by John Smith on October 17, 2002 22:52:22 UTC


I'm making a 10" dob. Should the sonotube be cut to the same length as the focal length? Or should it be longer to cut down on stray light?

Also, I really don't like the looks of dobs that have a box built around the tube. I would like to mount the bearings to the tube, but I'm worried about strength and future balance changes. Would it be alright to take a foot or so of the extra tube and cut it open, attach the bearings to it and then wrap it around the tube and secure it with big hose clamps?


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