Norbert reports: "I would have a telescope like the JMI NGT 12.5
but for a fraction of the cost. Base is the optical tube of a Meade
12" LightBridge Dobson. The tube is modified for a moderate
horseshoe mount: Declination wheels are shifted 100 mm (4 inches).
The self made rotatable top of the tube consists of sheet of 1 mm
aluminum instead of steel (lighter weight), attached with 3 spring
loaded toggle type fasteners. It was necessary to add a balance
weight."
Technical
Specifications: Type: Newtonian Aperture: 12 inch, f/5
Focal length: 1524 mm Weight of optical tube: 20 kg Balance
weight: 6,5 kg Weight of Mount: 20 kg Wood thickness: 24 mm
Horseshoe diameter: 752 mm (ca. 30 inches, made by router and
cycle) Driving roll diameter: 69,4 mm Angle polar axis
(latitude): 48°, adjustable EQ-3 stepping gear motor: n =
5,432/h ONDRIVE worm gear reducer: i = 12:1 Built: 2009
This telescope won
a first place award at International Telescopemeeting Vogelsberg
2009 (ITV 2009) Germany,