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Mirror Box Height

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Posted by Doug Tanaka on May 15, 2000 16:01:25 UTC

I`m planning on making a 12.5" truss tube Newtonian, with a restriction that the mirror box cannot be more than 12.25" tall so it can be stowed underneath the bed in our van ( my wife`s specifications; if up to me it might ride on the front seat). I am torn between the optical quality of an f6 and the lower balance point of an f5.6. I`m pretty sure I can fit a balanced unit under the 12.25", but I`m afraid the extra 5" in length when I go to f6 will force me to add a lot of weight to the mirror box (which I don`t want to do because I move the scope up and down two flights of stairs). I`m also hoping to make it a split-ring mounted, so I suppose the balance point could be moved up the trusses, but I`m afraid it would cause collimation problems. Any advice would be appreciated.

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