Celestron Omni XLT AZ 102 Instruction Manual
Celestron Omni XLT AZ 102 Manual
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- Celestron Omni XLT AZ 102 | Instruction Manual - Page 1
Omni XLT Series Telescopes INSTRUCTION MANUAL ● Omni XLT 102 ● Omni XLT 120 ● Omni XLT 150 ● Omni XLT127 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 2
...14 Installing the Eyepieces ...14 Moving the Telescope Manually ...15 Balancing the Mount in R.A...15 Balancing the Mount in DEC ...16 Adjusting the Mount...16 Adjusting the Mount in Altitude...17 Adjusting the Mount in Azimuth...17 TELESCOPE BASICS ...18 Image Orientation...20 Focusing ...20 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 3
Using the Lens Cap Aperture Stop with Refractor Telescopes 32 ASTROPHOTOGRAPHY ...33 Piggyback Photography...33 Short Exposure Prime Focus Photography for Refractors & Newtonians 34 Short Exposure Prime Focus Photography for Schmidt-Cassegrains 34 Eyepiece Projection for a Schmidt-Cassegrain 35 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 4
amount of maintenance. Furthermore, your Celestron telescope is versatile - it will grow as your interest grows. This instruction manual covers all the different models of the Omni XLT telescopes. . No matter at what level you are starting out, the Omni XLT Series telescopes will unfold for you and - Celestron Omni XLT AZ 102 | Instruction Manual - Page 5
12 11 10 9 1 2 3 4 5 6 7 8 Figure 1-1 Omni XLT 102 Refractor (Omni XLT 120 Refractor similar) 1. Optical Tube 2. Tube Rings 3. Finderscope 4. Eyepiece 5. Equatorial Mount 6. Latitude Adjustment Screw 7. 1.75" Steel Tripod 8. Accessory Tray/ Leg Brace 9. Counterweights 10. Counterweight Bar 11. - Celestron Omni XLT AZ 102 | Instruction Manual - Page 6
1 2 3 12 4 5 11 6 10 7 9 8 Figure 1-2 Omni XLT 150 Newtonian 1. Finderscope 2. Finderscope Bracket 3. Focuser 4. Eyepiece 5. Tube Rings 6. Equatorial Mount 7. 1.75" Steel Tripod 8. Accessory Tray/ Leg Brace 9. Counterweights 10. Counterweight Bar 11. Dovetail Slide Bar 12. Optical Tube 6 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 7
12 11 10 9 8 1 2 3 4 5 6 7 Figure 1-3 Omni XLT 127 Schmidt-Cassegrain 1. Optical Tube 2. Finderscope 3. Finderscope Bracket 4. Equatorial Mount 5. Latitude Scale 6. Accessory Tray/ Leg Brace 7. 1.75" Steel Tripod 8. Counterweights 9. Counterweight Bar 10. Declination Setting Circle 11. Dovetail - Celestron Omni XLT AZ 102 | Instruction Manual - Page 8
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 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 9
Attaching the Equatorial Mount 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 to the tripod head. On one side of the tripod head there is a metal alignment - Celestron Omni XLT AZ 102 | Instruction Manual - Page 10
and tighten. Installing the Counterweight Bar To properly balance the telescope, the mount comes with a counterweight bar and two counterweights. To install until tight. 5. Tighten the counterweight bar lock nut fully for added support (see fig 2-7). Once the bar is securely in place you are - Celestron Omni XLT AZ 102 | Instruction Manual - Page 11
tighten as in # 4. 6. Replace the counterweight safety screw. Attaching the Slow Motion Knobs The Omni mount comes with two slow motion control knobs that allows you to make fine pointing adjustments to the telescope in both R.A. and Declination. To install the knobs: 1. Locate the two knobs (both - Celestron Omni XLT AZ 102 | Instruction Manual - Page 12
on the Omni mounting platform to hold the telescope in place. 6 Hand tighten the mounting platform safety screw until the tip touches the side of the mounting bracket. NOTE: Never loosen any of the knobs on the telescope tube or mount other than the R.A. and DEC knobs. Figure 2-9 Refractor Optical - Celestron Omni XLT AZ 102 | Instruction Manual - Page 13
lens is toward the front (open) end of the telescope. 8. Tighten the set screw on the mounting bracket to hold the finderscope in place. For information on aligning your finderscope, see Telescope Basics section of this manual. Installing the Visual Back Only applicable to the Schmidt-Cassegrain - Celestron Omni XLT AZ 102 | Instruction Manual - Page 14
the star diagonal rotates freely. Rotate the diagonal to the desired position and tighten the set screw. Figure 2-11 Refractors - To use the star diagonal on refractor telescopes, it is inserted into the 1 ¼" eyepiece adapter. Installing the Eyepieces The eyepiece, or ocular as it is also called - Celestron Omni XLT AZ 102 | Instruction Manual - Page 15
Moving the Telescope Manually In order to properly balance your telescope, you will need to move your telescope manually at various instructions and will reduce undue stress on the mount. When taking astrophotographs, this balance process should be done for the specific area at which the telescope - Celestron Omni XLT AZ 102 | Instruction Manual - Page 16
is released. 6. .Tighten the tube ring screws firmly to hold the telescope in place. Figure 2-14 Figure 2-15 Like the R.A. balance, these are general balance instructions and will reduce undue stress on the mount. When taking astrophotographs, this balance process should be done for the specific - Celestron Omni XLT AZ 102 | Instruction Manual - Page 17
on the Omni mount has a range mount against gravity (i.e. using the rear latitude adjustment screw to raise the mount). To do this you should loosen both latitude adjustment screws and manually push the front of the mount Mount in Azimuth For rough adjustments in azimuth, simply pick up the telescope - Celestron Omni XLT AZ 102 | Instruction Manual - Page 18
telescopes, known as refractors, use lenses. Other telescopes, known as reflectors (Newtonians), use mirrors. Then, the Schmidt-Cassegrain telescope the rainbow, a phenomenon known as chromatic aberration. To get around this problem, a two-element lens, known as an achromat, was introduced. Each - Celestron Omni XLT AZ 102 | Instruction Manual - Page 19
enter the optical system, they travel the length of the optical tube three times. The optics of the Advanced Series Schmidt-Cassegrain telescopes have Starbright coatings - enhanced multi-layer coatings on the primary and secondary mirrors for increased reflectivity and a fully coated corrector for - Celestron Omni XLT AZ 102 | Instruction Manual - Page 20
Focusing To focus your refractor or Newtonian telescope, simply turn the focusing mechanism controls the primary mirror which is mounted on a ring that slides back and forth through focus without seeing the image. To avoid this problem, your first astronomical target should be a bright object - Celestron Omni XLT AZ 102 | Instruction Manual - Page 21
of Eyepiece (mm) Let's say, for example, you are using the 25mm eyepiece that came with your telescope. To determine the magnification you simply divide the focal length of your telescope (the Omni XLT 102 for this example has a focal length of 1000mm) by the focal length of the eyepiece, 25mm - Celestron Omni XLT AZ 102 | Instruction Manual - Page 22
of view using the same 25mm eyepiece that is supplied standard with all Omni XLT telescopes. The 25mm eyepiece has an apparent field of view of 50°. Divide . The apparent field of each eyepiece that Celestron manufactures is found in the Celestron Accessory Catalog (# 93685). General Observing Hints - Celestron Omni XLT AZ 102 | Instruction Manual - Page 23
Up to this point, this manual covered the assembly and basic operation of your telescope. However, to understand your telescope more thoroughly, you need to know a little about the night sky. This section deals with observational astronomy in general and includes information on the night - Celestron Omni XLT AZ 102 | Instruction Manual - Page 24
Motion of the Stars The daily motion of the Sun across the sky is familiar to even the most casual observer. This daily trek is not the Sun moving as early astronomers thought, but the result of the Earth's rotation. The Earth's rotation also causes the stars to do the same, scribing out a large - Celestron Omni XLT AZ 102 | Instruction Manual - Page 25
way to polar align a telescope is with a latitude scale. Unlike other methods that require you to find the celestial pole by identifying certain stars near it, this method works off of a known constant to determine how high the polar axis should be pointed. The Omni CG-4 mount can be adjusted from - Celestron Omni XLT AZ 102 | Instruction Manual - Page 26
named for the hemisphere in which they reside. For example, in the northern hemisphere all stars move around the north celestial pole. When the telescope's polar axis is pointed at the celestial pole, it is parallel to the Earth's rotational axis. Many methods of polar alignment require that you - Celestron Omni XLT AZ 102 | Instruction Manual - Page 27
the cross hairs so that one is parallel to the declination axis and the other is parallel to the right ascension axis. Move your telescope manually in R.A. and DEC to check parallelism. First, choose your star near where the celestial equator and the meridian meet. The star should be approximately - Celestron Omni XLT AZ 102 | Instruction Manual - Page 28
stars in the sky. If you don't, they can be learned by using the Celestron Sky Maps (#93722) or consulting a current astronomy magazine. Figure 4-6 To align the look up. 2. Center the star in the finderscope. 3. Look through the main telescope and see if the star is in the field. If not, find it and - Celestron Omni XLT AZ 102 | Instruction Manual - Page 29
Vernier Scale To increase the accuracy of the R.A. setting circle, the mount comes with a vernier scale. This device allows you to get more of the R.A. setting circle, then that is the coordinate the telescope is pointing at. The problem arises when the R.A. indicator (zero mark) is in between two - Celestron Omni XLT AZ 102 | Instruction Manual - Page 30
will be able to see most of the lunar disk at one time. For the Schmidt-Cassegrain telescope, the optional Reducer/Corrector lens allows for breath-taking views of the entire lunar disk when used contrast and bring out detail on the planetary surface, try using Celestron eyepiece filters. 30 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 31
To center the Sun without looking into the eyepiece, watch the shadow of the telescope tube until it forms a circular shadow. • To ensure accurate tracking, be airglow, and light pollution greatly affect transparency. While not a problem for the brighter stars and planets, bright skies reduce the - Celestron Omni XLT AZ 102 | Instruction Manual - Page 32
between these two extremes. Using the Lens Cap Aperture Stop with Refractor Telescopes As mentioned earlier, all refractive optics will exhibit some amount of bands and zones around Jupiter. The use of Celestron's Refractor Filter (# 94121) reduces the effect of chromatic aberration as well as improves - Celestron Omni XLT AZ 102 | Instruction Manual - Page 33
"B" or manual setting should guiding the telescope will not show up on film. To attach the camera to the refractor or Newtonian telescope, use the piggyback adapter screw located on the top of the tube mounting ring. For the Schmidt-Cassegrain telescope and read the camera instructions as each is - Celestron Omni XLT AZ 102 | Instruction Manual - Page 34
release. 8. Monitor your guide star for the duration of , etc.). The focuser for the refractors and Newtonian have a built-in mounted rigidly. You will follow your camera instructions for capturing images as the information below relates to 35mm SLR cameras. With your camera attached to the telescope - Celestron Omni XLT AZ 102 | Instruction Manual - Page 35
job a little easier, align the finder as accurately as possible. This allows you to get the object in the telescope's field based on the finder's view alone. Another problem introduced by the high magnification is vibration. Simply tripping the shutter ⎯ even with a cable release ⎯ produces enough - Celestron Omni XLT AZ 102 | Instruction Manual - Page 36
-Cassegrain. This device allows you to photograph and guide through the telescope simultaneously. Celestron offers a very special and advanced off-axis guider refractor and Newtonian telescopes you skip the comments about the Radial Guider but all else applies. Other equipment needs include a guiding - Celestron Omni XLT AZ 102 | Instruction Manual - Page 37
illuminated reticle to monitor your guide star. For this purpose, Celestron offers the Micro Guide Eyepiece (# 94171) Here is a brief summary of the technique. Note: Digital Cameras - follow the camera instructions on focusing and shutter data. 1. Polar align the telescope. For more information on - Celestron Omni XLT AZ 102 | Instruction Manual - Page 38
telescope is in essence a long focal length telephoto lens. 35mm SLR cameras are mounted directly to the telescope (using the built-in TAdapter on the refractors , speeds, etc. to get the best image desired. Metering The Omni Series telescopes have fixed apertures and, as a result, fixed f/ratios. To - Celestron Omni XLT AZ 102 | Instruction Manual - Page 39
will ensure your telescope performs at its best. Each optical design type has special collimation instructions described below. Omni refractor was properly aligned at the factory, however rough handling while traveling may eventually alter the alignment of the lens. Your Celestron refractor telescope - Celestron Omni XLT AZ 102 | Instruction Manual - Page 40
, while one views and instructs the other which screws are correctly turned and by how much. Start by loosening the Phillips head (mounting) screws about 1 turn on so that you won't have to manually track the star. Or, if you do not want to power up your telescope, you can use Polaris. Its position - Celestron Omni XLT AZ 102 | Instruction Manual - Page 41
de-focused star and notice in which direction the central shadow is skewed. 2. Place your finger along the edge of the front cell of the telescope (be careful not to touch the corrector plate), pointing towards the collimation screws. The shadow of your finger should be visible when looking into - Celestron Omni XLT AZ 102 | Instruction Manual - Page 42
your telescope using the optional Newtonian Collimation Tool (#94183) offered by Celestron. To collimate the telescope without the view. DO NOT loosen or tighten the center screw in the secondary mirror support, because it maintains proper mirror position. Aligning the Primary Mirror Now adjust the - Celestron Omni XLT AZ 102 | Instruction Manual - Page 43
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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 the primary mirror, locate the collimation screws on the rear of the telescope tube. The rear cell (shown in Figure 7-6) has three large thumbscrews - Celestron Omni XLT AZ 102 | Instruction Manual - Page 45
It may be helpful to have two people working together: one viewing and instructing which screws to turn and by how much, and the other performing the making the first, or each adjustment, it is necessary to re-aim the telescope tube to recenter the star again in the center of the field of view - Celestron Omni XLT AZ 102 | Instruction Manual - Page 46
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 Celestron website for complete - Celestron Omni XLT AZ 102 | Instruction Manual - Page 47
Celestron's Omni CG-4 mounts. It precisely controls the telescope's tracking speed during long, timed exposures of celestial objects, producing the best possible image sharpness. Four speeds are available-1x (sidereal), 2x for guiding telescope. Very easy to understand operating instructions - Celestron Omni XLT AZ 102 | Instruction Manual - Page 48
card expansion slot and USB cable. Sky Maps (# 93722) - Celestron Sky Maps are the ideal teaching guide for learning the night sky. You wouldn't set off on a the telescope. Each camera make (i.e., Minolta, Nikon, Pentax, etc.) has its own unique mount and therefore, its own T-Ring. Celestron has - Celestron Omni XLT AZ 102 | Instruction Manual - Page 49
25mm ep Field of View - Linear w/25mm ep Optical Tube Length Optical Tube Weight Mount & Counterweights - Weight Tripod Weight Total Weight Refractor 102mm (4.0") 1000mm f/10 Starbright XLT 6x30 1.25" 25mm (40x) Omni CG-4 1.75" Stainless 3.2kg (7#) & 1.8kg (4#) 240x 15x 12.5 1.36 1.14 212x 1.25° 66 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 50
and 16 per cent into a system of surrounding rings. A telescope mounting using two independent rotation axis allowing movement of the instrument in as "the apparent yearly path of the Sun against the stars". A telescope mounting in which the instrument is set upon an axis which is parallel to - Celestron Omni XLT AZ 102 | Instruction Manual - Page 51
to a celestial object is to measure its parallax. Refers to a group of eyepieces that all require the same distance from the focal plane of the telescope to be in focus. This means when you focus one parfocal eyepiece all the other parfocal eyepieces, in a particular line of eyepieces, will be in - Celestron Omni XLT AZ 102 | Instruction Manual - Page 52
the Celestial Equator eastward from the Vernal Equinox. Rated the most important advance in optics in 200 years, the Schmidt telescope combines the best features of the refractor and reflector for photographic purposes. It was invented in 1930 by Bernhard Voldemar Schmidt (1879-1935). This is the - Celestron Omni XLT AZ 102 | Instruction Manual - Page 53
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right to modify or discontinue, without prior notice to you, any model or style telescope. If warranty problems arise, or if you need assistance in using your telescope contact: Celestron Customer Service Department 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212 - Celestron Omni XLT AZ 102 | Instruction Manual - Page 60
Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212-5835 Web site at http//www.celestron.com Copyright 2007 Celestron All rights reserved. (Products or instructions may change without notice or obligation.) Item # 21088-INST Printed in China $10.00 01-07
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INSTRUCTION MANUAL
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Omni XLT 102
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