Threaded hole for tube connecting knob

Figure 17. The cast-metal dovetail trunnion on the left side panel of the base mates with the left side bearing of the telescope tube. Before mounting the tube on the base, turn the trunnion by hand so that the hole for the tube connecting knob is facing up.

Connecting the Optical Tube to the

Dobsonian Base

The telescope is now assembled and ready to be placed into the Dobsonian base. The left altitude hub on the optical tube has a dovetail slot that slides into the altitude axis trunnion on the inside of the left side panel (Figure 17). We recommend orienting the trunnion such that the threaded hole for the tube securing knob is facing upward. Then the telescope tube can be cradled horizontally and just lowered into the base by gen- tly sliding tube’s dovetail altitude hub into the mating recep- tacle of the altitude trunnion on the base (Figure 18). (Get help lifting the tube in place if it is too heavy or unwieldy for you.) The tube should now be resting in a balanced, horizon- tal position in the base. Then just insert and tighten the tube connecting knob to secure the tube in place (Figure 19).

Accessory Installation

Now that the base is assembled and the optical tube installed all that remains is to attach the EZ Finder II reflex sight and the eyepiece. These accessories can be found in a small box within the optical tube assembly box.

EZ Finder II

Using the included dovetail mounting bracket, the EZ Finder

IIwill slip neatly into the dovetail base preinstalled on your SkyQuest optical tube. The EZ Finder II arrives pre-installed in the mounting bracket. Just simply slide the dovetail mount- ing bracket into the telescope’s dovetail mounting base and tighten the thumbscrew on the base to secure the mounting bracket.

Operating the EZ Finder II

The EZ Finder II works by projecting a tiny red dot (it is not a laser beam) onto a lens mounted in the front of the unit. When

Figure 18. Hold the telescope tube as shown, with one hand on the rear end ring and the other cradling underneath the tube, gently lower the scope so the dovetail side bearing on the tube seats in the metal trunnion on the left side panel.

Figure 19. Secure the tube to the base with the tube connecting knob.

you look through the EZ Finder II, the red dot will appear to float in space, helping you to pinpoint your target object. The red dot is produced by a light-emitting diode (LED) near the rear of the sight. A 3-volt lithium battery provides the power for the diode. Turn the power knob (see Figure 20) clockwise until you hear the “click” indicating that power has been turned on. Look through the back of the reflex sight with both eyes open to see the red dot. Position your eye at a comfortable distance from the back of the sight. In daylight you may need to cover the front of the sight with your hand to be able to see

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Orion 10135 XT10g, 10135XT12g, #10134 XT8g Connecting the Optical Tube to Dobsonian Base, Accessory Installation, EZ Finder
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10135 XT10g, 10134 XTBg, 10135XT12g, #10134 XT8g specifications

The Orion #10134 XT8g, #10135 XT12g, #10134 XTBg, and #10135 XT10g are exceptional choices in the realm of computerized telescopes, catering to both novice stargazers and seasoned astronomers. These models are designed for easy use while delivering stellar performance and high-quality optics.

At the heart of these telescopes is the high-quality optics that Orion is renowned for. Each model features a primary mirror made from durable glass, enhanced with a parabolic shape to minimize optical distortions and improve light gathering capabilities. The XT8g and XT10g utilize an 8-inch and 10-inch mirror, respectively, while the XT12g boasts a large 12-inch aperture, providing users with deeper views of celestial phenomena. The larger the aperture, the more light the telescope can collect, revealing fainter objects in the night sky.

In terms of technology, the "g" designation signifies that these telescopes are equipped with Orion’s innovative GoTo system. This advanced motorized mount enables users to easily locate and track celestial objects with the push of a button, making the stargazing experience more enjoyable and accessible. The system includes a database of thousands of celestial objects, allowing users to explore the universe with ease.

The XTg models also come with an intuitive hand controller that features a user-friendly interface for navigating the night sky. Additionally, the telescopes can be controlled via a smartphone or tablet, providing flexibility for tech-savvy users who prefer modern conveniences.

Durability and stability are crucial in any telescope, and the XT series does not disappoint. Each model is constructed on a robust and stable base, designed to minimize vibrations and provide a steady view, even at higher magnifications. This stability ensures that amateur astronomers can enjoy detailed views, from the craters of the moon to the rings of Saturn and beyond.

Each telescope comes with a cradle-style altazimuth mount for easier adjustments and tracking capabilities. The included eyepieces allow for various magnifications, enhancing the viewing experience and enabling observers to appreciate the beauty of the cosmos.

In summary, the Orion XT series, including the #10134 XT8g, #10135 XT12g, #10134 XTBg, and #10135 XT10g, stands out for their exceptional optics, innovative GoTo technology, robust build quality, and user-friendly operation. These telescopes are ideal for anyone wishing to explore the wonders of the night sky, making them a worthy investment for years of astronomical discovery.
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