Celestron Omni Xlt Series Manual Owners Operating Guide

Celestron Omni Xlt Series Manual Owners Operating Guide free pdf ebook was written by Tom Suzuki on May 02, 2008 consist of 62 page(s). The pdf file is provided by www.celestron.com and available on pdfpedia since May 20, 2011.

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Celestron Omni Xlt Series Manual Owners Operating Guide pdf




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Celestron Omni Xlt Series Manual Owners Operating Guide - page 1
ENGLISH Omni XLT Series Telescopes Omni XLT 102 Omni XLT 102ED Omni XLT 120 Omni XLT127 Omni XLT 150 Omni XLT 150R INSTRUCTION MANUAL
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Celestron Omni Xlt Series Manual Owners Operating Guide - page 2
Table of Contents INTRODUCTION .......................................................................................................................................................... 4 Warning ...................................................................................................................................................... 4 ASSEMBLY .................................................................................................................................................................... 8 Setting up the Tripod .................................................................................................................................. 8 Attaching the Equatorial Mount ................................................................................................................. 9 Attaching the Center Leg Brace ............................................................................................................... 10 Installing the Counterweight Bar.............................................................................................................. 10 Installing the Counterweights................................................................................................................... 11 Attaching the Slow Motion Control Knobs (Cables)................................................................................ 11 Attaching the Telescope Tube to the Mount............................................................................................. 12 Installing the Finderscope......................................................................................................................... 13 Installing the Visual Back......................................................................................................................... 13 Installing the Star Diagonal ...................................................................................................................... 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 Aligning the Finderscope ......................................................................................................................... 21 Calculating Magnification ........................................................................................................................ 21 Determining Field of View....................................................................................................................... 22 General Observing Hints .......................................................................................................................... 22 ASTRONOMY BASICS............................................................................................................................................... 23 The Celestial Coordinate System ............................................................................................................. 23 Motion of the Stars ................................................................................................................................... 24 Latitude Scale ........................................................................................................................................... 25 Pointing at Polaris .................................................................................................................................... 25 Finding the North Celestial Pole .............................................................................................................. 26 Polar Alignment in the Southern Hemisphere .......................................................................................... 27 Pointing at Sigma Octantis ....................................................................................................................... 28 Finding the South Celestial Pole (SCP).................................................................................................... 28 Declination Drift Method of Polar Alignment.......................................................................................... 29 Aligning the R.A. Setting Circle .............................................................................................................. 30 Using the R.A. Vernier Scale ................................................................................................................... 31 CELESTIAL OBSERVING......................................................................................................................................... 32 Observing the Moon ................................................................................................................................. 32 Lunar Observing Hints ............................................................................................................................. 32 Observing the Planets ............................................................................................................................... 32 Observing the Sun .................................................................................................................................... 33 Solar Observing Hints .............................................................................................................................. 33 Observing Deep Sky Objects.................................................................................................................... 33 Seeing Conditions..................................................................................................................................... 33 2
Celestron Omni Xlt Series Manual Owners Operating Guide - page 3
Transparency ............................................................................................................................................ 33 Sky Illumination ....................................................................................................................................... 33 Seeing ....................................................................................................................................................... 34 Using the Lens Cap Aperture Stop with Refractor Telescopes ................................................................ 34 ASTROPHOTOGRAPHY ........................................................................................................................................... 35 Piggyback Photography............................................................................................................................ 35 Short Exposure Prime Focus Photography for Refractors & Newtonians................................................ 36 Short Exposure Prime Focus Photography for Schmidt-Cassegrains....................................................... 36 Eyepiece Projection for a Schmidt-Cassegrain......................................................................................... 37 Long Exposure Prime Focus Photography ............................................................................................... 38 Planetary and Lunar Photography with Special Imagers.......................................................................... 39 CCD Imaging for Deep Sky Objects ........................................................................................................ 40 Terrestrial Photography ............................................................................................................................ 40 Metering ................................................................................................................................................... 40 Reducing Vibration .................................................................................................................................. 40 TELESCOPE MAINTENANCE ................................................................................................................................. 41 Care and Cleaning of the Optics............................................................................................................... 41 Collimation of Refractors ......................................................................................................................... 41 Collimation of a Schmidt-Cassegrain....................................................................................................... 42 Collimation of a Newtonian ..................................................................................................................... 44 OPTIONAL ACCESSORIES ...................................................................................................................................... 48 APPENDIX A - TECHNICAL SPECIFICATIONS ...................................................................................................51 APPENDIX B - GLOSSARY OF TERMS.................................................................................................................. 52 SKY MAPS.................................................................................................................................................................... 55 CELESTRON TWO YEAR WARRANTY ................................................................................................................ 61 3
Celestron Omni Xlt Series Manual Owners Operating Guide - page 4
Congratulations on your purchase of an Omni XLT Series telescope. The Omni XLT Series of telescopes come in several different models: 102mm refractor, 102mm ED refractor, 120mm refractor, 150mm refractor, 150mm Newtonian, 127mm Schmidt-Cassegrain. The Omni Series is made of the highest quality materials to ensure stability and durability. All this adds up to a telescope that gives you a lifetime of pleasure with a minimal 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 your friends all the wonders of the Universe. Some of the many standard features of the Omni XLT include: Hand selected optical glass and hand figured optics resulting in superior images. Premium Celestron Starbright XLT optical coatings that provide maximum contrast and image sharpness. Heavy-duty equatorial mount with a rugged and very stable stainless steel tripod. Ball bearings in both axes of the mount ensure smooth performance. CD-ROM “The Sky” --- astronomy software which provides education about the sky and printable sky maps. Many other high performance features! The Omni XLT deluxe features combined with Celestron’s legendary optical systems give amateur astronomers the most sophisticated and easy to use telescopes available on the market today. Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your telescope, so you should keep this manual handy until you have fully mastered your telescope’s operation. The manual gives detailed information regarding each step as well as needed reference material and helpful hints guaranteed to make your observing experience as simple and pleasurable as possible. Your telescope is designed to give you years of fun and rewarding observations. However, there are a few things to consider before using your telescope that will ensure your safety and protect your equipment. Warning Never look directly at the sun with the naked eye or with a telescope (unless you have the proper solar filter). Permanent and irreversible eye damage may result. Never use your telescope to project an image of the sun onto any surface. Internal heat build-up can damage the telescope and any accessories attached to it. Never use an eyepiece solar filter or a Herschel wedge. Internal heat build-up inside the telescope can cause these devices to crack or break, allowing unfiltered sunlight to pass through to the eye. Never leave the telescope unsupervised, either when children are present or adults who may not be familiar with the correct operating procedures of your telescope. -4-
Celestron Omni Xlt Series Manual Owners Operating Guide - page 5
1 12 2 3 11 4 5 10 9 7 6 8 Figure 1-1 Omni XLT 102 Refractor (Omni XLT 102ED, Omni XLT 120 and Omni XLT 150R refractors are similar) 1. 2. 3. 4. 5. 6. Optical Tube Tube Rings Finderscope Eyepiece Equatorial Mount Latitude Adjustment Screw 7. 8. 9. 10. 11. 12. 1.75" Steel Tripod Accessory Tray/ Leg Brace Counterweights Counterweight Bar Dovetail Slide Bar Objective Lens Shade -5-
Celestron Omni Xlt Series Manual Owners Operating Guide - page 6
1 2 3 12 4 5 11 6 10 7 9 8 Figure 1-2 Omni XLT 150 Newtonian 1. 2. 3. 4. 5. 6. Finderscope Finderscope Bracket Focuser Eyepiece Tube Rings Equatorial Mount 7. 8. 9. 10. 11. 12. 1.75" Steel Tripod Accessory Tray/ Leg Brace Counterweights Counterweight Bar Dovetail Slide Bar Optical Tube -6-
Celestron Omni Xlt Series Manual Owners Operating Guide - page 7
12 11 10 9 1 2 3 4 5 8 6 7 Figure 1-3 Omni XLT 127 Schmidt-Cassegrain 1. 2. 3. 4. 5. 6. Optical Tube Finderscope Finderscope Bracket Equatorial Mount Latitude Scale Accessory Tray/ Leg Brace 7. 8. 9. 10. 11. 12. 1.75" Steel Tripod Counterweights Counterweight Bar Declination Setting Circle Dovetail Slide Bar Schmidt Corrector Lens -7-
Celestron Omni Xlt Series Manual Owners Operating Guide - 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 easy to identify the various parts and familiarize you with the correct assembly procedure before attempting it outdoor. Each Omni telescope comes in two boxes. One box contains the tripod, tripod accessory tray/brace, equatorial mount, counterweight bar, two counterweights, R.A. knob, Dec knob, polar axis polar cap, and a Phillips head screwdriver. The second box contains the telescope optical tube assembly, finderscope and bracket, eyepiece, and other standard accessory items per the specific model that you have. Setting up the Tripod Remove the tripod from the box that it is in (Figure 2-1). The Omni tripod comes with an all metal center leg brace/accessory tray to give rock solid support to the mount. The tripod comes fully assembled with a metal plate, called the tripod head that holds the legs together at the top. In addition, there is a central rod that extends down from the tripod head that attaches the equatorial mount to the tripod. To set up the tripod: 1. 2. 3. 4. 5. Stand the tripod upright and pull the tripod legs apart until each leg is fully extended. The tripod will now stand by itself (Figure 2-2). Once the tripod is set up, you can adjust the height at which it stands. Loosen the lever (turn counterclockwise) on the leg clamp so that the tripod leg can be adjusted (Figure 2-3). Slide the center portion of the tripod leg away from the tripod head until it is at the desired height. Tighten the levers (turn clockwise) on each leg clamp to hold the legs in place. The standard height of the tripod is 33” and it can be extended at any height up to a maximum of 47”. Remember that the tripod will be the most rigid and stable at the lowest height. Figure 2-1 Figure 2-2 Figure 2-3 -8-
Celestron Omni Xlt Series Manual Owners Operating Guide - 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 peg for aligning the mount. This side of the tripod will face north when setting up for an astronomical observing session. To attach the equatorial head: 1. 2. 3. 4. Locate the azimuth adjustment screws on the equatorial mount (see Figure 2-4). Retract the screws so they no longer extend into the azimuth housing on the mount. DO NOT remove the screws since they are needed later for polar alignment. Hold the equatorial mount over the tripod head so that the azimuth housing is above the metal peg. Place the equatorial mount on the tripod head so that the two are flush. You can rotate the mount slightly to the center position (where the front latitude adjustment screw is directly over the “N” on the tripod). Then tighten the azimuth adjustment screws. Tighten the mounting knob (attached to the central rod) on the underside of the tripod head to hold the equatorial mount firmly in place. Tripod Head 5. Equatorial Mount Alignment Peg Mounting Knob Figure 2-5 Azimuth Adjustment Screws Figure 2-4 -9-
Celestron Omni Xlt Series Manual Owners Operating Guide - page 10
Attaching the Center Leg Brace Tripod Mounting Knob Central Rod Accessory Tray Accessory Tray Knob Figure 2-6 1. 2. 3. Remove the accessory tray knob and washer from the central rod. Slide the accessory tray over the central rod so that each arm of the tray is pushing against the inside of the tripod legs. Thread the accessory tray knob onto the central rod and tighten. Installing the Counterweight Bar To properly balance the telescope, the mount comes with a counterweight bar and two counterweights. To install the counterweight bar: 1. 2. 3. 4. 5. Remove the counterweight safety screw from the counterweight bar (opposite of the threaded end). Thread the counterweight bar through the counterweight bar locking nut. Locate the opening in the equatorial mount on the DEC axis. Thread the counterweight bar into the opening until tight. Tighten the counterweight bar lock nut fully for added support (see fig 2-7). Once the bar is securely in place you are ready to attach the counterweights. Counterweight Bar Locking Nut Counterweight Locking Screw Counterweights Counterweight Bar Safety Screw Figure 2-7 - 10 -
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