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Summary of Contents for Meade ETX-90EC
- Page 1 Instruction Manual ETX-90EC Astro Telescope ETX-125EC Astro Telescope Meade Instruments Corporation...
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Page 2: Parts Diagram
ETX-90EC: 8 x 21mm Erect-Image Viewfinder ETX-125EC: 8 x 25mm Right-Angle Viewfinder 3. Eyepiece holder thumbscrew 4. 90° eyepiece holder 5. Optical tube: ETX-90EC: 90mm clear aperture ETX-125EC: 127mm clear aperture 6. Vertical (or Declination) lock 7. Fork-mount attachment screws 8. -
Page 3: Table Of Contents
Assembly Instructions ....5 Telescope Features ......6 Quick Tips . -
Page 4: Quick-Start Guide
Moderate Slow Use the arrow keys (H) of the Electronic Controller to move the telescope up and down and/or left and right. To change the telescope’s slew speed, press the SPEED key (I). The indicator lights signify the speed, with the upper light showing the highest speed. Each press slows the speed down one level, then cycles back to the highest speed. -
Page 5: Chapter 1: Getting Started
Assembly of both ETX model telescopes requires eight (user- supplied) AA-size batteries and the following steps: 1. a. ETX-90EC 8 x 21 mm Viewfinder: Slide the eyepiece end of the viewfinder through the front of the viewfinder bracket (1, Fig. 3). -
Page 6: Telescope Features
Fig. 1. Turning the vertical lock c o u n t e r c l o ckwise unlocks the telescope enabling it to be freely rotated by hand about the vertical axis. -
Page 7: First Observations
1. Set the telescope on a level and stable surface, or mount to Blinking the Meade #883 Deluxe Field Tripod (see O P T I O N A L ACCESSORIES, page 17). 2. Insert a low-power eyepiece (e.g., SP 26mm) into the eyepiece holder (4, Fig. -
Page 8: The Viewfinder
ETX-90EC 8 x 21 mm Erect-Image Viewfinder: Standard equipment with the ETX-90EC, the 8 x 21mm Erect- Image Viewfinder has 8-power magnification and an aperture of 21mm. This viewfinder presents a correctly oriented image both up-and-down and left-to-right. -
Page 9: Chapter 2:Telescope Fundamentals
ETX optical tube. For example, the ETX-90EC’s focal length is 1250mm, or about 49”. This means that if the ETX–90EC were a classical refracting- type of telescope, its optical tube would be more than four feet long instead of the ETX–90EC's compact 11”... -
Page 10: Terrestrial Observing
East to West. The speed at which the stars move is called the sidereal rate. Never use a Meade ETX Astro Telescope to look at the Sun! Looking at or near the Sun will cause instant and irreversible damage to your eye. Eye dama ge is often painless, so there is no warning to the observer that damage has occurred until it is too late. -
Page 11: The Electronic Controller
(2) Removing either A or B screw affects only the telescope’s default mode; you may still make mode changes at will during telescope operation using the MODE key (see E l e c t ro n i c Controller Modes, below). -
Page 12: Chapter 3: Polar Alignment
To Polar align using the #883 Deluxe Field Tripod (Fig. 13), follow the instructions provided with the tripod. To Polar align using the #880 (ETX-90EC) or #881 Table Tripod (ETX–125EC), use the following procedure. 1. Make sure the viewfinder is aligned with your ETX telescope (see Aligning the Viewfinder, page 8). - Page 13 Dec.at 90° Fig.16: Example of Polar Alignment Using the #880 Table Tripod and ETX-90EC. (1) Standard tripod leg with latitude scale; (2) High-latitude hole; (3) Alternate hole; (4) Fixed tripod legs; (5) Declination pointer; (6) Thumbscrew; (7) R.A. scale pointer; (8) #1422 low-latitude balance weight.
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Page 14: Chapter 4: Observing
1960’s and early 1970’s. However, no telescope on Earth can see these footprints or any other artifacts. In fact, the smallest lunar features that may be seen with the largest telescope on Earth are about one-half mile across. NOTE:Except during its early or late crescent phases, the Moon can be an exceptionally bright object to view through the telescope. -
Page 15: Photography With Both Etx Models
1. Use the optional table tripod specific to your model of ETX, or the #883 Deluxe Field Tripod as a platform for the telescope. At effective focal lengths of 1250mm to 1450mm (ETX-90EC) or 1900mm to 2310mm (ETX–125EC), even small external vibrations can easily ruin an otherwise good photo. -
Page 16: Chapter 5: Optional Accessories
ETX telescopes, are available at more than 2000 dealer locations in the U.S. and Canada and through Meade international distributors worldwide. Once you have identified the accessories you wish to order, contact your local Meade authorized dealer.To find a dealer near you, call (949) 451-1450 visit www.meade.com. - Page 17 67° (ETX-125EC). OPTIONAL ACCESSORIES #1422 Low-Latitude Balance Weight (for ETX-90EC): If the ETX-90EC is to be used with the #880 Table Tripod and polar- aligned at latitudes below 30°, the telescope can become unbalanced, particularly if heavier accessories (e.g., a camera body) are attached to the eyepiece-end of the telescope.
- Page 18 #765 Soft Carry Bag: The Meade soft-padded carry bag (Fig. 31) is well suited to travel with the ETX-90EC. Each carry bag includes a shoulder strap and permits ready transport of the complete telescope, including accessories.
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Page 19: Chapter 6: Maintenance And Servicing
Storage and Transport When the telescope is not in use, store it in a cool, dry place. Do not expose the instrument to excessive heat or moisture. It is best to store the telescope in its original box with the vertical and horizontal locks (6 and 10, Fig. -
Page 20: Meade Customer Service
8:30 Friday. In the unlikely event that the ETX requires factory servicing or repairs, write or call the Meade Customer Service Department first, before returning the telescope to the factory, giving full particulars as to the nature of the problem, as well as your name, address, and daytime telephone number. -
Page 21: Telescope Specifications
Secondary mirror obstruction (dia.; %) . . 27.9mm (1.1”); 9.6% Telescope mounting ....fork type; double tine Setting circle diameters ....Dec: 3.5”; RA: 7”... -
Page 22: Appendix A:tracking Motor Speed
For objects, like the Moon or a comet, that move at slightly different rates, the Electronic Controller arrow keys (1, Fig. 6) are sufficient to move the telescope slightly as the object very slowly moves off-center through the eyepiece field. -
Page 23: Appendix B: Helpful Charts
Appendix B: HELPFUL CHARTS Latitude Chart for Major Cities of the World To aid in the polar alignment procedure (see page 12), latitudes of major cities around the world are listed below. To determine the latitude of an observing site not listed on the chart, locate the city closest to your site. -
Page 24: Appendix C: Precise Polar Alignment; Setting Circles
Although the above procedure is somewhat tedious (since the field of view of the telescope with the SP26mm eyepiece is only about 1°), it is a worthwhile effort if precise polar alignment is desired (e.g., if photography of the Moon or a planet is to be performed). -
Page 25: Appendix D: Roadmap To The Stars
Appendix D: ROADMAP TO THE STARS The night sky is filled with wonder and intrigue. You too can enjoy exploring the universe simply by following a few pointers on a roadmap to the stars. First, find the Big Dipper, which is part of the constellation Ursa Major. -
Page 26: Appendix E: You And The Universe
Appendix E: YOU AND THE UNIVERSE APPENDIX The distance from the Earth to the Moon Radius = 239,000 miles The distances between the planets The distance from the Earth to the Sun is 93 million miles or 1 Astronomical Unit (AU) Pluto’s elliptical orbitis eccentric and carriesthe planet inside theorbit ofNeptune at itsclosest approachto theSun. -
Page 27: Meade Limited Warranty
ONE YEAR from the date of original purchase in the U.S.A. and Canada. Meade will repair or replace a product, or part thereof, found by Meade to be defective, provided the defective part is returned to Meade, freight-prepaid, with proof of purchase. - Page 28 Meade Instruments Corporation 6001 OAK CANYON, IRVINE, CALIFORNIA 92618-5200 U.S.A. (949) 451-1450 FAX: (949) 451-1460 www.meade.com ® Ver. 0300 is a registered trademark of Meade Instruments Corporation. Part no. 14-1010-20...
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No vision available from the eye piece Meade 90
A possible cause of no vision from the eyepiece on the Meade ETX-90EC could be that the telescope is pointed at or near the Sun, which can cause instant and irreversible eye damage. Another possibility is that the viewfinder or telescope is not properly focused or aligned. Additionally, if the optional #932 Erecting Prism is not used, terrestrial images may appear reversed, which could be mistaken for no vision.
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