Table of Contents, Unpacking, Parts List

Congratulations on your purchase of an Orion SkyQuest XTg GoTo Dobsonian. It is an observer’s dream telescope, offering quality diffraction-limited optics; a stylish, easy-to-setup base outfitted with automated, computerized GoTo technology; and a sturdy design. This high-performance astronomical instrument will provide dazzling views of celestial objects, yet be transportable and wonderfully easy

to use.

With the alt-azimuth GoTo system, you simply select an object from the 42,900 object database and the telescope will take you there with the push of a couple of buttons. Searching for objects is a thing of the past, as the GoTo servo motors and computerized database find them for you in seconds, then track them while you enjoy the view! Deluxe features such as a 2" dual-speed Crayford focuser, enhanced-reflectivity mirror coatings, and full accessory assortment provide everything you need to enjoy your journey through the universe.

Please read these instructions thoroughly before beginning assembly and subsequent use of the telescope.

1. Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3. The GoTo Hand Controller . . . . . . . . . . . . . . . . . . . . . . 10

4. Setup for AutoTracking or GoTo Mode . . . . . . . . . . . . . 11

5. Using the Telescope in AutoTracking Mode . . . . . . . . . 12

6. Alignment for GoTo Operation . . . . . . . . . . . . . . . . . . . 12

7. Using the Telescope in GoTo Mode . . . . . . . . . . . . . . . 14

8. Collimating the Optical System . . . . . . . . . . . . . . . . . . 20

9. Using Your Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10. Astronomical Observing. . . . . . . . . . . . . . . . . . . . . . . . 23

11. Care and Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . 25

12. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Menu Tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Appendix A: Time Zones of the World . . . . . . . . . . . . . . . . 29 Appendix B: RS-232 Connection . . . . . . . . . . . . . . . . . . . . 30 Star Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

1. Unpacking

The telescope is packed in two boxes, one containing the opti- cal tube assembly and accessories, another containing the unassembled Dobsonian base. The 12" model has a third box containing the primary mirror in its cell. Be careful unpacking the boxes. We recommend keeping the original packaging. In the event that the telescope needs to be shipped to another

C E G I

Figure 2. Contents of the optical tube box: A) Optical tube,

B)Dust cap, C) Holster with mounting screws, D) EZ Finder II with bracket, E) Hex keys, F) collimation cap, G) 1.25" 12.5mm illuminated Plössl eyepeice, H) 2" 28mm DeepView eyepiece, I) Starry Night CD-ROM, J) eyepiece rack with mounting screws.

location, or returned to Orion for warranty repair, having the proper packaging will help ensure that your telescope will sur- vive the journey intact.

Before beginning assembly, unpack each box and confirm that all of the parts in the Parts List below are present. The parts are listed by the box they should arrive in, but some of the parts may be in different boxes than indicated below. Be sure to check all boxes carefully, as some parts are small. If anything appears to be missing or broken, immedi- ately call Orion Customer Support (800-676-1343) or email support@telescope.com for assistance.

Parts List

Box #1: Optical Tube Assembly and Accessories (Refer to Figure 2)

Qty. Description

1Optical Tube Assembly

1Dust cover

128mm Deep View eyepiece, 2" barrel diameter

112.5mm Illuminated Plössl eyepiece, 1.25" barrel diameter

1EZ Finder (with bracket)

1Collimation cap

1Eyepiece rack

2Eyepiece rack wood screws (20mm long, color black)

2Hex keys (2mm, 3mm)

1Tube connecting knob

1Hand controller holster (with 2 assembly screws)

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.

Orion 10134 XTBg, 10135 XT10g, 10135XT12g, #10134 XT8g Table of Contents, Unpacking, Parts List

Models: 10135 XT10g 10134 XTBg 10135XT12g #10134 XT8g