Instruction/ maintenance manual of the product #27189 XT12I Orion
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IN 226 Rev . I 08/11 INSTRUCTION MANUAL Orion SkyQuest ™ XTi IntelliScope Dobsonian T elescopes #27182 XT6i , #27183 XT8i , #27184 XT10i , #27189 XT12i Customer Support (800)-676-1343 E-mail: support@telescope.com Corporate Offices (831)-763-7000 89 Hangar W ay , Watsonville, CA 95076 Orion T elescopes.
2 Figure 1. The SkyQuest XT8 IntelliScope Secondar y mirror holder with 4-vane spider (not visible) Left side panel F oot (3) Primar y mirror cell IntelliScope Controller P or t modular jack Altitude .
3 Congratulations on y our purchase of an Orion SkyQuest XTi IntelliScope Dobsonian . It is a high-perf or- mance astronomical instrument designed to provide dazzling views of celestial objects and unprecedent- ed ease of use.
4 3 Plastic f eet 3 F eet attachment wood screws (length 1") 5 Encoder board mounting wood scre ws 1 Brass b ushing 1 Azimuth axis he x-head screw (length 2.25") 2 F ender washers (diameter 1") 1 He x lock nut 4 Altitude bearing cylinders 4 Altitude bearing cylinder screws (length 1.
5 Ne xt, assemble the rear end ring to the mirror cell. Find a clean, flat surf ace, and tur n the mirror cell ov er so that the mirror is f acing downwards.
Assembly of the Dobsonian Base Ref er to Figure 2 dur ing base assembly . The base need only be assembled once , unless you disassemble it f or long-term storage. The assembly process takes about 45 min utes and requires, in addition to the supplied tools , a Phillips screw - driver , and two adjustab le crescent wrenches.
7 6. Place a fender w asher (H) onto the azimuth axis screw (I). Then push the screw up through the hole in the ground baseplate (A).Then slide the encoder disk (J), flat side down, onto the azimuth axis scre w . 7. Place the brass bushing (F) onto the azim uth axis screw (I) so that the wide end of the bushing is closest to the encoder disk (J).
8 Ne xt, you’ll need to install the altitude encoder board assem- bly . T o do so , please refer to the separate instruction manual f or the IntelliScope Computer ized Object Locator . Installing the V ertical Stop Place three flat washers onto the shaft of the v er tical stop screw .
9 T o install the XT system, follo w these steps while referring to Figures 10 and 11: 1. Select one of the retaining/tensioning knobs and slide the metal washer onto the shaft, f ollowed b y the white nylon washer (y ou will need to thread this washer onto the shaft).
10 The CorrecT ension system is now installed. If y ou wish to remov e the optical tube from the base, you will first need to unthread and remov e both the knobs. Once the optical tube is remov ed from the base, thread the knobs back into the altitude bearings so you do not lose them.
dust cap on the front of the telescope tube should alwa ys remain in place when the telescope is not in use. It is also a good idea to store ey epieces in an ey epiece case and to replace the cov er caps on the focuser and finder scope when the telescope is idle.
12 Focusing the T elescope With the 25mm Sirius Plössl ey epiece in the focuser and secured with the thumbscrew(s), mo ve the telescope so the front (open) end is pointing in the general direction of an object at least 1/4-mile aw ay . Now , with y our fingers, slowly rotate one of the f ocusing knobs until the object comes into shar p f ocus.
13 of f ocus, you will need to ref ocus the finder scope for y our vision. Loosen the lock ring located behind the objectiv e lens cell on the body of the finder scope (see Figure 12a ) by tur n- ing it counterclockwise . Back the loc k r ing off by a f ew turns, f or now .
14 retaining and tensioning knobs of the CorrecT ension(XT) sys- tem holding the optical tube captiv e on the base, the entire telescope can be carried as one unit. (This is not practical f or the XT10i and XT12i due to the hefty weight and size.) This requires some caution, howe v er.
15 When putting the IntelliScope into a vehicle , common sense pre vails. It is especially impor tant that the optical tube does not get knock ed around; this can cause the optics to become misaligned, and could dent the tube. W e recommend trans - por ting and storing the tube assembly in an optional padded case f or proper protection.
Preparing the T elescope for Collimation Once you get the hang of collimation, y ou will be able to do it qui ckly even in th e dar k. When tr ying it for the first time or two , though, it is best to collimate in daylight, pref erab ly in a brightly lit room and with the telescope aimed at a white wall.
17 of the secondar y mirror (with the “dot” of the collimation cap) is off-center . The tilt of the primar y mirror is adjusted with three spr ing- loaded collimation thumbscrews on the bac k end of the opti - cal tube (bottom of the primar y mirror cell); these are the larger thumbscrews .
18 B. Seeing and T ransparency Atmospheric conditions play a huge part in quality of view - ing. Light from stars and other celestial objects must tra vel through miles of Ear th’ s atmosphere to reach our eyes . The air in the atmosphere will refract and bend the light.
19 if you wish. This is especially recommended for small and bright objects like planets and double stars . The Moon also takes higher magnifications w ell. Deep-sky objects, ho wev er , typically look better at medium or low magnifications . This is because many of them are quite f aint, yet hav e some extent (apparent width).
20 tive to color in f aint light. Still, there is something v er y special about seeing an astronomical object in real time, with y our own e yes — “live, ” if not in living color . Note About Astrophotography SkyQuest IntelliScope Dobsonians are designed f or visual, not photographic use.
21 7. Car e and Maintenance If you giv e your telescope reasonable care, it will last a lif e - time. Store it in a clean, dr y , dust-free place, safe from r apid changes in temperature and humidity . Do not store the tele - scope outdoors, although storage in a gar age or shed is OK.
22 8. Specifications SkyQuest XT6i IntelliScope Primar y mirror : 150mm diameter , parabolic, center marked Primar y mirror mater ial: Low thermal expansion optical glass Mirror coatings: Enhanced-reflectivity (94%) aluminum, SiO 2 ov ercoat Secondar y mirror minor axis: 34.
23 SkyQuest XT10i IntelliScope Primar y mirror : 254mm diameter , parabolic, center marked Primar y mirror mater ial: Low thermal expansion optical glass Mirror coatings: Enhanced-reflectivity (94%) aluminum, SiO 2 ov ercoat Minor axis of secondar y mirror : 63mm F ocal length: 1200mm F ocal ratio: f/4.
24 One-Y ear Limited W arranty This Orion SkyQuest IntelliScope Dobsonian Reflecting T elescope is warranted against def ects in mater ials or workmanship for a period of one y ear from the date of purchase. This warranty is f or the benefit of the or iginal retail purchaser only .
An important point after buying a device Orion #27189 XT12I (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Orion #27189 XT12I yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Orion #27189 XT12I - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Orion #27189 XT12I you will learn all the available features of the product, as well as information on its operation. The information that you get Orion #27189 XT12I will certainly help you make a decision on the purchase.
If you already are a holder of Orion #27189 XT12I, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Orion #27189 XT12I.
However, one of the most important roles played by the user manual is to help in solving problems with Orion #27189 XT12I. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Orion #27189 XT12I along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
