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Thanks Eric, Alexander, Malcolm Gino, and jjjnettie.
The Herschel's 20 ft, 20 inch was roughly equivalent to a 16" so I should be able to see most of their objects.
If you want to buy a GSO 16" the base is 68cm high and 81 cm diameter. The EP is 183 cm above the ground when pointing to the zenith.
The two tubes are 49cm diameter, the lower one is 61 cm long and the upper one is 29cm long.
I am thinking I might replace the two base circles with MonoPan to make the base lighter.
Last edited by glenc; 09-11-2011 at 02:26 AM.
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