Instruction/ maintenance manual of the product XLT series Celestron
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O O m m n n i i X X L L T T S S e e r r i i e e s s T T e e l l e e s s c c o o p p e e s s I I N N S S T T R R U U C C T T I I O O N N M M A A N N U U A A L L ● ● O O m m n n i i X X L L T T 1 1 .
2 T T a a b b l l e e o o f f C C o o n n t t e e n n t t s s INTRODUCTION .......................................................................................................................................................... 4 Warning ...........
Using the Lens Cap Apertu re Stop with Refractor Tele scopes ................................................................ 32 ASTROPHOTOGRAPHY .........................................................................................................
Congratulations on your purchase of an Om ni XLT Series telescope. The Omni XLT Series of telescopes come in several different models --- 102mm refractor, 120mm refractor, 150mm Newtonian, 127mm Schmidt- Cassegrain. The Omni Series is made of the highest qualit y materials to ensure stability and durabi lity.
Figure 1-1 Omni XLT 102 Refractor 1 2 3 4 5 6 7 8 9 10 11 12 (Omni XLT 120 Refractor similar) 1. Optical Tube 7. 1.75" Steel Tripod 2. Tube Rings 8. Accessory Tray/ Leg Brace 3. Finderscope 9. Counterweights 4. Eyepiece 10. Counterweight Bar 5. Equatorial Mount 11.
1 2 4 5 6 7 8 9 10 11 12 3 Figure 1-2 Omni XLT 150 Newtoni an 1. Finderscope 7. 1.75" Steel Tripod 2. Finderscope Bracket 8. Accessory Tray/ Leg Brace 3. Focuser 9. Counterweights 4. Eyepiece 10. Counterweight Bar 5. Tube Rings 11. Dovetail Slide Bar 6.
1 2 3 4 6 7 8 9 10 11 12 5 Figure 1-3 Omni XLT 127 Schmidt-Cassegrain 1. Optical Tube 7. 1.75" Steel Tripod 2. Finderscope 8. Counterweights 3. Finderscope Bracket 9. Counterweight Bar 4. Equatorial Mount 10. Declination Setting Circle 5. Latitude Scale 11.
This section c overs the assem bly instructio ns for your Cel estron Om ni XLT te lescope. The e quatorial m ount is exactly the same for all the Omni telescope models and th e optical tubes have some differences which will be noted.
A A t t t t a a c c h h i i n n g g t t h h e e E E q q u u a a t t o o r r i i a a l l M M o o u u n n t t The equatorial m ount allows you to tilt the telescope’s axis of rotation so that you can tr ack the stars as they move across the sky . The Om ni mount is a German e quatorial m ount that attaches to the tripod head.
A A t t t t a a c c h h i i n n g g t t h h e e C C e e n n t t e e r r L L e e g g B B r r a a c c e e Exhibit 2-6 1. Remove the accessory tray knob an om the centr al rod. sory tray over the centra l rod so that each arm of the tray is pushi ng against the inside of the tripod legs.
mount so th at the polar axis is pointing wards north before the tube assembly and co unterw eights are attached. This will make the polar lignment procedure much easier.
5. The DEC sl ow moti on knob attaches in the sam e manne r as the R.A. knob. The shaft that the DEC slow motion ount, just below the telescope mounting platform. Once again, you have o shafts to choose from. Use the shaft that is poin ti ng toward the ground.
I I n n s s t t a a l l l l i i n n g g t t h h e e F F i i n n d d e e r r s s c c o o p p e e elescope tube (on r efractors and S chmidt-C assegrain) and nt of the telescope tube (Newtonian), there is a sm all bracket with a set screw in it. This is where the erscope: 1.
I I n n s s t ta l l l l i i n n g g t t h h e e S S t t a a r r D D i i a a g g o o n n a a l l he st fractors and Sc hmidt- asseg n are ph o attach t Schmidt- assegrain: 1.
The refracting telescopes can use eyepieces and diagonals of a 2” barrel diameter. To us e a 2” ba rrel eyepiece, the 1 ” eyepiece adapter must first be removed. To do this, simply loosen the two chrome thum bscrews located around e focuser barrel (see figure 2-12) a nd remove the 1 ¼” ad apte r.
B B a a l l a a n n c c i i n n g g t t h h e e M M o o u u n n t t i i n n D D E E C C . amp and r otate the tele scope so that it is on one side of the mount (i.e., as described in the . Release the tube — GRADUALLY — to see which way it rotates around the declinatio n axis.
A A d d j j u u s s t t i i n n g g t t h h e e M M o o u u n n t t i i n n A A l l t t i i t t u u d d e e • To increase the latitu d e of the polar axis, tighten the rear latitude adjustm ent screw and loos en the front sc rew (if necessary).
A telescope is an instrum ent that collects and fo cuses light. Th e nature of the optical design determines how the light is fo c used. ome tele opes, known as re telescopes, known as reflecto rs (Newtonians), use mirrors. Then , the chmidt- ssegrai elescop ses.
19 Figure 3-3 A A c c u u t t a a w w a a y y v v i i e e w w o o f f t t h h e e l l i i g g h h t t p p a a t t h h o o f f t t h h e e S S c c h h m m i i d d t t - - C C a a s s s s e e g g r r a .
20 I I m m a a g g e e O O r r i i e e n n t t a a t t i i o o n n he image orientation ch anges depending on how the eyepiece is inse rted into th e telescope. When using the star diagonal with fractors and Schmidt-Cassegrains, the image is right-side-up, but reversed from left-t o-right (i.
21 A A l l i i g g n n i i n n g g t t h h e e F F i i n n d d e e r r s s c c o o p p e e ccurate alignment of the finder makes it easy to fi nd objects with the telescope, especially celestial obj ects. To 1 hoose a target that is in excess of one mile away.
D D e e t t e e r r m m i i n n i i n n g g F F i i e e l l d d o o f f V V i i e e w w To e = ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ s section, we can determine the field of v iew using the same 25m.
Up to this point, this manual covered the assembly and ba sic operation of your teles cope . However, to understand your telescope more thoroughl t the night sky.
24 aily motion of the Sun across the sk y is familiar to ev en the m st casua l observer. This dail y trek is not the Sun oving as early astronomers thought, but the result of the Earth ' s rotation. The Earth's rotation also causes the stars to o the same, scribing out a large circle as the Earth completes one rotation.
25 L L a a t t i i t t u u d d e e S S c c a a l l e e he easiest way to polar align a telescope is with a latitude scale. Unlike other methods th at require you to find the this example, the distance from the northern hor izon to the celestial pole is always equal to your latitude.
26 igning, do NOT move the telescop e in R.A. or DEC. You do not want to move the ar axis. The telescope is used s imply to see where the polar axis is poin ting. Remember, while Polar al elescope itself, but the pol t Like the previous method, this gets yo u close to the pole but not directly on it.
27 D D e e c c l l i i n n a a t t i i o o n n D D r r i i f f t t M M e e t t h h o o d d o o f f P P o o l l a a r r A A l l i i g g n n m m e e n n t t the telescope.
28 A A l l i i g g n n i i n n g g t t h h e e R R . . A A . . S S e e t t t t i i n n g g C C i i r r c c l l e e aps (#93722) or consultin g a current astronomy m agazine. nd easy to look up. 3. o e field. If not, find it and center it. 4. 5. rdinates o f the star.
29 8. ipping in R.A. The telescope will track in R.A. as 9. d the object should be there. For some of the fainter objects, you may not be W you can “star hop” throug h the fi This process can be repeat e d for any given ni g ht . U U s s i i n n g g t t h h e e R R .
30 With your telescope set up, you are read y to use it for observing. This secti on covers visual observing hints for both lar system and deep sky objects as well as general obs erving conditions which will affect your abili ty to observe. so O O b b s s e e r r v v i i n n g g t t h h e e M M o o o o n n eat o in g s.
31 O O b b s s e e r r v v i i n n g g t t h h e e S S u u n n Although overlooked by many amateur astronomers, solar obser vation is both rewarding and fun. However, because e Sun is so bright, special precautions must be taken when observing our st ar so as not to damage your eyes or your lescope.
S S e e e e i i n n g g ity of the atmosphere and d i rectly affects the amount of fine detail seen in extended s vary from time-to-time and place-to-place. The size of the air parcels compared to your aperture eeing conditions refers to th e stabil S objects.
After looking at the night sky for a while you may want to try photographing it. Several form s of photography are possible with your telescope, including terr estrial and celestial ph otography. Both of these are discussed in moderate detail with enough information to get you started.
34 4. e infinity setting. 5. he telescope s o that it poi nts in that 6. 7. 8. . Set the shutter speed to the “B” setting and focus the lens to th Locate the area of the sky that you want to phot ograph and move t direction. Find a suitable guide star in t h e telescope eyepiece field of view.
35 • Any 100 to 400 ISO co lor slide film . Focus the telescope by turning the focus knob until the image is sharp. 4. 5. . Advance the film and repeat the process . Lunar Phase ISO 100 ISO 200 ISO 400 • Fuji Su per HG 400 2. Center the M oon in the field of y our telesco pe.
36 desired target in the viewfinder of your camera. s possible. 5. Wait for the vibration caused b y releasing the shutter to diminish . Also, wait for a moment of good seeing. e telescope for the duration of th e exposure (see accompan y ing table). Replace the bl e fro telescop 8.
37 ith an illuminated reticle to monitor your guide star. For this purpose, Celestron offers the M icro Guide Eyepiece using and shu tter data. polar aligning, se e the Polar Alignment sec tion earlier in th e manual. . Remove all vis ual accessories .
CCD CCD I I m m a a g g i i n n g g f f o o r r D D e e e e p p S S k k y y O O b b j j e e c c t t s s pecial cameras have been de veloped for taking images of deep sk y images. These have evolved over the last sev eral ateurs can ta ke fantastic images.
Whil s a t its be C C a a e your telescope requ ires little maintenan ce, there are a few things to remember that will ensure your telescop e perform st.
Figure 7-2 similar to the diffraction Pick a bright star and center it in the field of the telescope. Study the image of the star while r acking it in and out of foc us using focus pattern is present,.
Before you begin the collim ation process, be sure that your te lescope is in thermal equ ilibrium with the surroundings. Allow 4 5 minutes for the t elescope to reac h equilibrium if you move betw een large tempera ture extremes. To verify collimation , view a star near the zenith.
42 C C The ng) the ce. Poo rror is th e three rews, placed 120 degrees apart, at the end of the telesc ope tube. The se condar y mirror (the small, elliptical mirror nder the focuser, in the front of the tube) also has thre e adjustment screws.
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Night Time Star Collimating After successfully completing dayti me collimatio n, night time star collimation can be done by closely adjusting t he prim ary mirror whil e the tele scope tube is on its m ount and pointing at a br ight star.
Figure 7-8 A collimated telescope should appear as a symmetrical ring pattern similar to the diffraction disk seen here. Take note of t he direction t he light appears to flare.
You will find that additional accessories for your Omni te lescope will enhanc e your viewing pleasure and expand the usefulness of your telescope. F or ease of referen ce, all the acces sories are listed in alphab e tical order.
Diagonal 2" Mirror (# 93519) - Celestron offers a 2" 90° Mirror Diagonal to slides into the barrel o f a 2" refractor focuser. This diagonal includes multicoated mirror and sm ooth mec.
48 e mount and therefore, its own T- Ring. Celestron has 8 diff erent models for 35mm cameras. which ce ts y y SkyScout ( # 93970) – A hand held personal planetarium that identifies and locates objects in the night sky. 6,000 object database with audio descriptions of over 200 popular objects.
A A p p p p e e n n d d i i x x A A T T e e c c h h n n i i c c a a l l S S p p e e c c i i f f i i c c a a t t i i o o n n s s Omni XLT Series 21088 21090 31057 11084 Omni XLT 102 Omni XLT 120 Omni XLT 150 Omni XLT 127 O segrain ptical Design Refracto r Refractor Newtonian Schmidt- Cas Aperture 102mm (4.
A A p p p p e e n n d d i i x x B B - - G G l l o o s s s s a a r r y y o o f f T T e e r r m m s s A - Abs The apparent mag at a star wou it were obser a standard di 10 parsecs, or 32.6 li olut Sun e o would just be visible lear m y . Air isk The apparent si ze f a star's disk produced even b y a perfect optical system .
Focal length The distance between a l ens (or mirror) a brought to focus. The focal length divid e nd the point at whi c h the image of an object at inf inity is d by the aperture of the mirror or lens is termed the focal ratio. J - ets r (LY) m/ sec.
Resolution The minimu m detectable angl e an optical system can d etect. Beca use of diffraction, th ere is a limit to the minimum angle , resolution. The l arger the aperture, the bett er the resolution.
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C C e e l l e e s s t t r r o o n n T T w w o o Y Y e e a a r r W W a a r r r r a a n n t t y y A. Celestron warrants this telescope to be free from defects in materials and work ma nship for two years.
Celestron 283 Torr Tel. Fax 310) 212-5835 Copy All rights reserved. (Products or instructions may change with tem # 21088-INST rin 5 Columbia Street nce, CA 90503 U.S.A. a (310) 328-9560 . ( Web site at http//www.celestron.com right 2 007 Celestr o n out notice or ob ligation.
An important point after buying a device Celestron XLT series (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Celestron XLT series 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 Celestron XLT series - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Celestron XLT series you will learn all the available features of the product, as well as information on its operation. The information that you get Celestron XLT series will certainly help you make a decision on the purchase.
If you already are a holder of Celestron XLT series, 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 Celestron XLT series.
However, one of the most important roles played by the user manual is to help in solving problems with Celestron XLT series. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Celestron XLT series 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
