This means that the primary mirror has a diameter of 250 mm, or 10 inches. The Explore Scientific 10” Truss Dob is, as the name states, a 10-inch Dobsonian.While it is a truss-style telescope, the Explore Scientific 10 inch dob is still a Newtonian reflector type telescope with some basic features that you will find in most telescopes that you should be aware of before purchasing this scope. These factors make truss telescopes extremely portable and lightweight. The poles make up the bulk of the telescope’s length but are quite small. The truss poles detach from the upper and lower sections of the telescope easily, leaving only the lower and upper tube assemblies, which themselves are very small. Truss poles are the set of eight poles that form a triangular shape (hence the name “truss”) and make the telescope extremely rigid-perhaps more rigid than a closed tube telescope. Truss poles replace the typically very heavy metal tubes that become impractical for large telescopes, and they make the telescope far more portable. The truss poles are the main feature in a telescope like this. The upper tube assembly is also very light as it is almost completely hollow while still being quite strong. Typically, the upper tube assembly is formed of two lightweight rings with struts in between, as you will find on this telescope. The upper tube assembly sits on top of the truss poles, and it holds the secondary mirror, finderscope, and focuser of the telescope. The truss poles attach to the top of the mirror box. The mirror box is where the altitude bearings attach, as they pivot up and down. The mirror box is typically very short because it only serves to hold the mirror in place and collimate the mirror. Next is the mirror box, and it is, as the name implies, where the main mirror is located. Because the truss telescope design has a much different center of gravity, the rocker box can be very short. The rocker box in a truss telescope is the part that contains the bearings to move the telescope up, down, left, and right, and it is what the telescope sits on. A truss telescope consists of four major parts: the base/rocker box, the mirror box, the truss poles, and the upper tube assembly.
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