The eyepiece height varies between 65cm (26 inches) at the horizon to 124cm (49 inches) at the zenith. When assembled, the base of the scope is squat: the altitude axis is just 45cm (18 inches) from the ground. In three separate sessions of transporting and reassembling the scope, we found that collimation was essentially unaffected. The connecting system on the primary mirror section and the upper section of the tube makes the setup extremely rigid. It’s quick and easy to put the LightBridge together, thanks to the clever design of the three 60cm long (24-inch) A-frame truss sections. When we signed for delivery, we were staggered by how small its cardboard box was for its aperture: it packs away to just 77 x 46 x 44cm (30 x 18 x 17-inches). Staggeringly small Just as we were going to press last month, we got hold of a 10-inch truss-tube Dobsonian from the Meade LightBridge range. These so-called truss-tube Dobsonians can be broken down into very manageable sections, so that instruments of 18-inch aperture and more can be carried in a family estate car. Instead of the tube, lightweight tubular bars connect the primary mirror and altitude axis at the base of the telescope to the secondary mirror and focuser at the top. Website: Although a telescope’s tube is its largest single component, manufacturers of large aperture Dobsonians like to get rid of it.
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