Table of Contents

 

1.

Unpacking

3

2.

Assembly

4

3.

Using Your Telescope

6

4.

Observing Tips

9

5.

Astronomy Basics

10

6.

Care and Maintenance

13

7.

Specifications

13

Appendix A: Collimation (Aligning the Mirrors)

14

Appendix B: Cleaning the Optics

15

1. Unpacking

The telescope will arrive in two boxes, one containing the optical tube assembly and accessories, the other containing the unassembled Dobsonian base. Be careful unpacking the boxes. We recommend keeping the original shipping con- tainers. In the event that the telescope needs to be shipped to another location, or returned to Orion for warranty repair, having the proper shipping containers will help ensure that your telescope will survive the journey intact.

Make sure all the parts in the Parts List below are present. Be sure to check boxes carefully, as some parts are small. If any- thing appears to be missing or broken, immediately call Orion Customer Support (800-676-1343) for assistance.

WARNING: Never look directly at the Sun through your telescope or its finder scope—even for an instant—without

a professionally made solar filter that completely covers the front of the instrument, or permanent eye damage could result. Young children should use this telescope only with adult supervision.

Parts List

Box #1: Optical Tube Assembly and Accessories

Qty. Description

1Optical tube assembly

1Optical tube Dust cover

125mm Sirius Plössl eyepiece, 1.25" barrel diameter

110mm Sirius Plössl eyepiece, 1.25" barrel diameter

1Eyepiece rack w/mounting wood screws

16x26 Correct-Image finder scope w/O-Ring

1Finder scope bracket

2Spring coils

2 Pull loops

1 Collimation cap

4Nylon spacers (black)

21/4" washers (black)

2Phillips head screws (black, length 1-1/2")

Box #2: Dobsonian Base

Qty. Description

1Left panel

1Right panel

1Front brace

1Top baseplate

1Ground baseplate

10Base assembly screws

4Trim caps (black)

3Plastic feet

3Feet attachment wood screws (length 3/4")

1Self-adhesive rubber bumper

1Large hex-head bolt (length 2")

23/8" washers

1 3/8" lock nut

1Nylon spacer (white)

1T-nut

3

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Orion XT4.5 instruction manual Table of Contents, Unpacking, Parts List