Orion XT10 User Manual

INSTRUCTION MANUALIN 165 Rev. D 05/08Providing Exceptional Consumer Optical Products Since 1975Customer Support (800)676-1343E-mail: support@telescop

alignment is important to ensure the peak performance of your telescope, so it should be checked regularly. Collimation is rela-tively easy to do and

possible. It may not be perfectly centered, but that is OK. Now tighten the three small alignment screws equally to secure the secondary mirror in tha

12the image with the focusing knob. If the telescope is correctly collimated, the expanding disk should be a perfect circle (Figure 18). If the image

13matter. Your eyes take about 30 minutes to reach perhaps 80% of their full dark-adapted sensitivity. Many observers notice improvements after severa

14shadows fall on the craters and canyon walls to give them defi-nition. While the full moon may look like a tempting target, it is not optimal for vi

est deep-sky objects, first catalogued about 200 years ago by the French astronomer Charles Messier.Determine in which constellation the object lies.

16rors, the better. Small specks of dust or flecks of paint have virtually no effect on the visual performance of the telescope.The large primary mirr

17SkyQuest XT 10"Primary mirror focal length: 1200mmPrimary mirror diameter: 254mm, BK7 optical glassFocal Ratio: f/4.7Focuser: Crayford, ac

18One-Year Limited WarrantyThis Orion SkyQuest XT telescope is warranted against defects in materials or workmanship for a period of one year from the

Secondary mirror with 4-vane spider (not shown)Right side panelFront braceEyepiece Rack (optional)HandleTop baseplateGround baseplate2Figure 1. The Sk

Table of Contents 1. Unpacking...3 2. Assembly ...4 3. Using Your Telescope ...

42. AssemblyNow that you have unpacked the boxes and familiarized your-self with all the parts in front of you, it’s time to begin assembly. The optic

5Once in the cradle, the tube should pivot freely up and down with gentle hand pressure. Note that the tube will not yet be properly balanced, since t

6used under dark skies and a bright setting is used under light-polluted skies or daylight.At the end of your observing session, be sure to turn the

7The CorrecTension system is now installed and engaged. If you wish to remove the telescope from the base, you will first need to disconnect the sp

which will lock the focuser drawtube in place once the tele-scope is properly focused. If you find the drawtube tension when focusing is either too ti

more light-collecting area, or aperture, can yield higher mag-nifications than a smaller aperture telescope. The maximum practical magnification for