![]() Alternatively, the tension adjuster can be completely tightened to lock the optical tube in position. The tension adjuster can be tightened such that the optical tube can stay in a position but can still be moved when prompted to adjust the position of the optical tube. By providing such a tension adjuster, the telescope does not need to be balanced in order to stay in position. The object of the Sky-Watcher Tension Control Handle invention (Patented) is to provide a tension adjuster that users can easily turn to add or reduce tension, thereby increasing or decreasing the friction between the optical tube and the sideboard of the mount. ![]() ![]() These devices are inconvenient to use because they do not provide a simple and user-friendly way to adjust the friction. ![]() The devices for stabilizing a telescope on the Dobsonian mount currently available include a sliceable weight to counterbalance the weight of the telescope, a friction lock that must be adjusted to inhibit movement of the telescope, and a spring attached to the telescope tube and mount to aid in stabilization. As long as the amount of friction is at an appropriate level, and therefore stabilization of the optical tube is achieved, the telescope can remain in its desired position to view an object and maintain its position even when the mount is rotated. This makes stabilizing the optical tube of the telescope difficult when using a Dobsonian mount, especially when accessories, such as a finderscope or an eyepiece, are added to the optical tube. If there is too little friction, the telescope will not stay where it is positioned. If there is too much friction, the telescope is difficult to move to center an object in the field of view. The Dobsonian mount usually relies on the friction between the side bearings on the optical tube of the telescope and a frictional material on the saddle to hold the optical tube in place. In its simplest form, the Dobsonian mount consists of a box which allows the optical tube assembly for pivoting in altitude, while the box itself is swiveled on a base in azimuth. If the result suggests your existing telescope / camera. The Dobsonian mounted telescope is popular among amateur astronomers and telescope makers because of its simplicity. The calculator uses maths to determine its result, it is not influenced by brand or sales spiel. What is Dobsonian Telescope and why the Tension Control Handle?Ī simple, elegant form of an alt-azimuth mount made to carry a Newtonian reflector was popularized by John Dobson in the late 1970’s. This model also includes the new feature-tension control handle. Dobsonian telescopes that they can mount and transport by. In addition, this model includes a 2″ focuser with a 1.25″ adapter, allowing the use of either eyepiece size. Rather than shopping for the fanciest model money can buy, think about how youll use a telescope. It is ready to use out of the box.The Sky-Watcher Dobsonian Telescope 250mm/1200mm 10″) have a “paraboloidal” primary mirror to eliminate spherical aberration and a four-arm, secondary- mirror bracket with fine supports (0.5mm thick), to reduce diffraction spikes and light loss. It comes with several extras, including a Crayford focuser for extra smooth focussing with no spring-back, an 8x50 finder scope and two eyepieces. Roller bearings allow for precise pointing and tracking. The mount has a brake/tension system that makes it easy to keep the scope in balance, for example when changing eyepieces. They are machined and polished to better than 1/12 wavelength, sometimes 1/16 wavelength, which is considerably better than the industry norm. GSO mirrors are made from optical quality BK7 glass and are limited only by diffraction, which means they achieve the theoretical maximum resolution possible for the size of the mirror. The limit on what you can see will not be the telescope, it will be the observing conditions. Planets and the moon can be viewed in stunning detail. The 10 inch (254mm) primary mirror collects 56% more light than an 8". Images are bright. Planetary nebulae will be full of details that cannot be seen in smaller scopes. Another great thing about this 10-inch Dobsonian telescope is that it comes with a two-inch Crayford style focuser that features all-metal bearings. This is simple and intuitive for beginners when compared with more complicated mounts. Best 5 Dobsonian Telescopes For Sale Best Small Tabletop Dobsonian Telescope Celestron 21024 FirstScope Telescope. Setting up is as simple as putting the mount on the ground, slotting in the tube and turning the tension knobs. You navigate the night sky by moving the scope left and right, up and down, by hand. It consists of a solid tube and a wooden box-like mount. Add to List Get Sale Alert edge-creditcard. Dobsonians give the best value for money of any telescope. You get a large aperture at an affordable price. Top Rated Gear: Celestron StarSense Explorer 10 Smartphone App-Enabled Dobsonian Telescope.
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