Page 3 - OPTIONAL ACCESSORIES
Using the Lens Cap Aperture Stop with Refractor Telescopes ................................................................ 32 ASTROPHOTOGRAPHY ........................................................................................................................................... 33 Piggyback Pho...
Page 5 - Figure 1-1 Omni XLT 102 Refractor
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. Dovetail Slide Bar 6. Latitude...
Page 6 - Figure 1-2 Omni XLT 150 Newtonian
1 2 4 5 6 7 8 9 10 11 12 3 Figure 1-2 Omni XLT 150 Newtonian 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. Equatorial Mount 12. Optical Tube 6
Page 7 - Figure 1-3 Omni XLT 127 Schmidt-Cassegrain
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. Dovetail Slide Bar 6. Accessory Tray/ ...
Page 8 - Figure 2-2
This section covers the assembly instructions for your Celestron Omni XLT telescope. The equatorial mount is exactly the same for all the Omni telescope models and the optical tubes have some differences which will be noted. Your Omni telescope should be set up indoor the first time so that it is ea...
Page 9 - attaches to the tripod head. On one side of the; Do NOT remove; ighten the azimuth adjustm
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 mount allows you to tilt the telescope’s axis of rotation so that you can track the stars as they move across the sky. The Omni mount is a German equatorial mount that attaches ...
Page 12 - Refractor Optical Tube is shown. The; tube, make sure that the declination and right ascen
5. The DEC slow motion knob attaches in the same manner 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 pointing toward the ground. This makes it easy to reach while oking throu...
Page 13 - Telescope Basics
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 refractors and Schmidt-Cassegrain) and nt of the telescope tube (Newtonian), there is a small bracket with a set screw in it. This is where the erscope: 1. tment screws so they don’t pro...
Page 14 - Refractors –; Focuser Knob; Eyepiece; Visual Back
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 Schmidt- asseg n are ph o attach t Schmidt- assegrain: 1. rn t into (i. o 2. Slide t 3. ighten the set screw on the visual back to hold the star diagonal in you wish to change the orie...
Page 15 - GRADUALLY
The refracting telescopes can use eyepieces and diagonals of a 2” barrel diameter. To use a 2” barrel eyepiece, the 1 ” eyepiece adapter must first be removed. To do this, simply loosen the two chrome thumbscrews located around e focuser barrel (see figure 2-12) and remove the 1 ¼” adapter. Once rem...
Page 16 - . Release the tube —; — to see which way it rotates around the declination axis.; DO NOT LET GO; ved NOT by moving the telescope in R.A. or
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 rotate the telescope 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 declination axis. DO NOT LET GO 5. 6. .Tigh...
Page 18 - New; is; refractor; tonian; diagonal
A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused. ome tele opes, known as re telescopes, known as reflectors (Newtonians), use mirrors. Then, the chmidt- ssegrai elescop ses. Each optical design is briefly discussed be...
Page 20 - object that is farther than the one you are currently; nob counterclockwise.
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 changes depending on how the eyepiece is inserted into the telescope. When using the star diagonal with fractors and Schmidt-Cassegrains, the image is right-side-up, but reversed from left-to-right (i.e., mirror ...
Page 21 - and DEC clamps and point the telescope at your target.
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 find objects with the telescope, especially celestial objects. To 1 hoose a target that is in excess of one mile away. This eliminates any possible parallax eff...
Page 22 - a linear field width of 65.6
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 view using the same 25mm eyepiece that is supplied standard with all Omni XLT nuing tance apparent field of each eyepiece that Celestron manufactures ...
Page 23 - The celestial sphere seen from the outside showing R.A. and DEC
Up to this point, this manual covered the assembly and basic operation of your telescope. However, to understand your telescope more thoroughl t the night sky. This section deals with observational astronomy t sky and polar alignment. T T h h e e C C y, you need to know a little abou in general and ...
Page 25 - NOT; et the telescope up so that the polar axis is pointing north.
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 that require you to find the this example, the distance from the northern horizon to the celestial pole is always equal to your latitude. If you are observi...
Page 26 - s the point in the northern hemisphere around which all; Definition
26 igning, do NOT move the telescope in R.A. or DEC. You do not want to move the ar axis. The telescope is used simply to see where the polar axis is pointing. Remember, while Polar al elescope itself, but the pol t Like the previous method, this gets you close to the pole but not directly on it. Th...
Page 29 - Figure 4-7 Vernier Scale; Remember
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” through the fi This process can be repeated for any given night. U U s s i i n n g g t t h h e e R R . . A A . . V V e e r r n ni Lock the R....
Page 30 - Planetary Observing Hints
30 With your telescope set up, you are ready to use it for observing. This section covers visual observing hints for both lar system and deep sky objects as well as general observing conditions which will affect your ability 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 ...
Page 32 - Figure; to excellent conditions; will be unnoticeable.
S S e e e e i i n n g g ity of the atmosphere and directly 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 the stabil Sobjects. The air in our atmosphere acts as a lens wh...
Page 34 - See note about digital cameras below.
34 4. e infinity setting. 5. he telescope so that it points 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 photograph and move t direction. Find a suitable guide star in the telescope eyepiece field of view. This is re...
Page 35 - . Advance the film and repeat the process.; Lunar Phase; • Fuji Super HG 400; Crescent
35 • Any 100 to 400 ISO color 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 Super HG 400 2. Center the Moon in the field of your telescope. 3 Set the shutter speed to th...
Page 38 - telescope makes an excellent
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 developed for taking images of deep sky images. These have evolved over the last several ateurs can take fantastic images. Several books have been written on ow to get the...
Page 39 - Do NOT rub in circles!
Whil s at its be C C a a e your telescope requires little maintenance, there are a few things to remember that will ensure your telescope perform st. Each optical design type has special collimation instructions described below. r r e e a a n n d d C C l l e e a a n n i i n n g g o o f f t t h h e e...
Page 40 - Do NOT remove or back out the holder screws more than one (1) to two; Do NOT over tighten the outer mounting screws!; Refractor Collimating Eyepiece
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 racking it in and out of focus using focus pattern is present, then collimation is ear as a concentric ring pattern similar to is approximately polar aligned r poin...
Page 44 - Night Time Star Collimating; Small thumbscrews are for locking the mirror in place; turn will make a difference, with approximately a
Night Time Star Collimating After successfully completing daytime collimation, night time star collimation can be done by closely adjusting the primary mirror while the telescope tube is on its mount and pointing at a bright star. The telescope should be set up at night and a star's image should be ...
Page 45 - ar's position in the field of view and turning the
Figure 7-8 A collimated telescope should appear as a symmetrical ring pattern similar to the diffraction disk seen here. Take note of the direction the light appears to flare. For example, if it appears to flare toward the three o'clock position in the field of view, then you must move whichever scr...
Page 46 - ollimation Eyepiece 1 1⁄4” –; OMNI Plössl; Flashlight
You will find that additional accessories for your Omni telescope will enhance your viewing pleasure and expand the usefulness of your telescope. For ease of reference, all the accessories are listed in alphabetical order. This is just a short listing of various accessories and please visit the Cele...
Page 48 - Sky Map; high power
48 e mount and therefore, its own T-Ring. Celestron has 8 different 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. Comes w...
