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To provide the most stable platform from which to polar align your ETX Astro Telescope you may wish to purchase 
the ETX Field Tripod (Fig. 5). The tripod head tilts easily to your local latitude angle for quick polar alignment, and 
locks in a 90° position to facilitate terrestrial viewing. 

 

d. Locating Astronomical Objects

 

 
Now that your telescope is fully assembled and polar aligned, you are ready to begin observations. 

For the beginning amateur astronomer, the simplest method of locating objects in the night sky - and an excellent 
way to learn how to operate your telescope - is to look at a celestial object that can be clearly seen with your own 
eyes. 

To move the telescope freely in R.A and Dec, first loosen both the R.A. and Dec Locks (11 and 21, Fig. 1). Find the 
desired object in the viewfinder, center the object in the viewfinder's crosshairs, then observe through the main 
telescope's eyepiece. Tighten the R.A. and Dec locks. Then, adjust the focus knob until the image is clear and 
sharp. 

The positions of celestial objects change over the course of the year, so you should obtain a star chart (such as the 
Meade Star Charts, available from your Meade dealer) or refer to the monthly star charts presented in astronomy 
magazines, such as 

Sky & Telescope

 and 

Astronomy

Once the object is centered in the eyepiece, it is necessary to slowly turn the R.A. Slow-Motion Control (10, Fig. 1) 
to keep the object in the field of view. However, once the telescope is polar aligned, the motor drive (described 
below) may be used to automatically track on the object. 

e. The Motor Drive

 

 
The ETX Astro Telescope is driven by a DC electronic motor control system, powered by three AA-size batteries 
located inside the telescope's drive base (see GETTING STARTED). 

To use the motor drive, follow this procedure: 

1.  With the telescope polar aligned as described above, turn the motor drive on, using the switch (8, Fig. 3) 

located on the bottom of the drive base. 

2.  Northen/Southern Hemisphere Operations: Observers located in the Earth's northern hemisphere (e.g., 

North America, Europe, Japan) should place the N-S switch (7, Fig. 3) permanently in the "N" (north) 
position. Observers in the Earth's southern hemisphere (e.g., Australia and most of South America) should 
place this switch in the "S" position, resulting in motor drive operation in the opposite direction. 

3.  After switching the motor drive on, allow one minute for the drive to take up any internal gear-backlash. 

During this initial one minute period, the motor drive is non-operative. 

4.  Now, as you move the telescope from object to object, the motor drive will automatically track, or follow, the 

object, fully compensating for the effects of the Earth's rotation. When each new object is centered in the 
telescope's field, the R.A. Lock and Dec Lock should be locked; the motor drive takes hold within a few 
seconds after the R.A. Lock is locked. 

f. Setting Circles

 

 
The ETX is equipped with R.A. and Dec Setting Circles (15 and 18, Fig. 1). To aid the observer in the location of 
faint celestial objects, setting circles emulate the celestial coordinates found on star charts and in sky catalogs. Any 
charted object can be easily located by their R.A. (in hours, minutes, and seconds, from Oh 0m 0sec to 23h 59m 
59sec) and Dec (from 0° to ±90°) coordinates. 

With the ETX telescope polar aligned, turning the R.A. SlowMotion Control (10, Fig. 1) moves the telescope in 
Right Ascension; turning the Dec Slow-Motion Control (16, Fig. 1) moves the telescope in Declination. 

Summary of Contents for ETX Series

Page 1: ...irements for optical quality and field performance The result of more than five years in development by an elite team of Meade optical designers and engineers the Meade ETX is without question one of the most revolutionary telescopes to be developed in the past 25 years We urge the ETX user to read this manual thoroughly in order that you might avail yourself of all the designed in features at you...

Page 2: ...ay be necessary to slightly unthread the six alignment screws 4 and 6 Fig 2 to fit the viewfinder into the bracket With the viewfinder inside the bracket tighten to a firm feel only the six alignment screws down against the viewfinder tube Alignment of the viewfinder is detailed in this manual b Remove the SP 26mm eyepiece 1 Fig 1 from its plastic storage container and place it in the telescope s ...

Page 3: ...from moving horizontally Turning the R A Lock counterclockwise unlocks the telescope horizontally enabling the telescope to be freely moved by hand in a horizontal direction Turning the R A Lock clockwise locks the telescope in horizontal position R A Slow Motion Control 10 Fig 1 With the R A Lock in the unlocked position the R A Slow Motion Control may be used for manual slewing of the telescope ...

Page 4: ...ide the eyepiece before reaching focus Focal length is usually printed on the side of the eyepiece The Meade ETX is supplied with one eyepiece as standard equipment a Super Plössl SP 26mm eyepiece Thus the focal length of the provided eyepiece is 26mm Super Plössl refers to the optical design of the eyepiece a design specifically intended for high performance telescopes and one which yields a wide...

Page 5: ...he ETX viewfinder unlike most telescope viewfinders presents a correctly oriented image both up and down and left to right This orientation particularly facilitates the location of terrestrial objects The 8 x 21mm viewfinder is also a tremendous aid in locating faint astronomical objects before their observation in the main telescope a Focusing the Viewfinder The ETX viewfinder has been factory pr...

Page 6: ... the telescope on its drive base as shown in Fig 1 the telescope may be used for an extremely wide range of land observations Keep in mind however that terrestrial images through the ETX Astro Telescope will be right side up but reversed left for right Normally such an image orientation is not bothersome unless the observer is trying to read a distant sign for example If the telescope is to be use...

Page 7: ...e allows full use of its many optical and electromechanical capabilities It is in astronomical applications where the ETX s extremely high level of optical performance is readily visible The range of observable astronomical objects is with minor qualification limited only by the observer s motivation Understanding how and where to locate celestial objects and how those objects move across the sky ...

Page 8: ...onomical observations in the same way as just described for terrestrial observations simply set the telescope on a tabletop locate objects through the viewfinder and then observe through the main telescope Objects can be tracked or followed as they move across the sky by turning one or both of the R A and Dec Slow Motion Controls 10 and 16 Fig 1 Such usage of the telescope however is unnecessarily...

Page 9: ...umbscrew which locks the inner section to the outer section e Replace the center leg in the drive base The latitude scale will now be placed at an easily readable position 4 Unlock the R A Lock and Dec Lock 11 and 21 Fig 1 and rotate the telescope so that it is oriented as shown in Fig 8 Re lock the R A Lock and Dec Lock In this orientation the telescope s optical tube is lined up parallel to the ...

Page 10: ...lable and allows for polar alignment as high as 66 latitude Important note For almost all astronomical observing requirements approximate settings of the telescope s latitude and polar axis are acceptable Do not allow undue attention to precise polar alignment of the telescope interfere with your basic enjoyment of the instrument c Alternate Polar Alignment Procedure If desired more precise polar ...

Page 11: ...control system powered by three AA size batteries located inside the telescope s drive base see GETTING STARTED To use the motor drive follow this procedure 1 With the telescope polar aligned as described above turn the motor drive on using the switch 8 Fig 3 located on the bottom of the drive base 2 Northen Southern Hemisphere Operations Observers located in the Earth s northern hemisphere e g No...

Page 12: ...to read the R A of the object 3 The R A circle is now calibrated to read the correct R A of any object at which the telescope is pointed The Dec circle is already calibrated as described above 4 Without touching the setting circles move the telescope manually by unlocking the R A and Dec Locks or by using the R A and Dec Slow Motion Controls so that the setting circle indicators 5 and 6 Fig 7 read...

Page 13: ...hotography has its own rewards however rewards that short focus lenses can not duplicate A few tips on photography through the ETX 1 Use a rigid tabletop or the optional Meade ETX Field Tripod as a platform for the telescope At effective focal lengths of 1250mm to 1450mm even small external vibrations can easily ruin an otherwise good photo 2 Use a cable operated shutter release Touching the camer...

Page 14: ... half and full much like those of the Moon The disk of Venus appears white as sunlight is reflected off its thick cloud cover Mars is about half the diameter of Earth Mars appears as a tiny reddish orange dot It may be possible to see a hint of white at one of the planet s polar ice caps When Mars is closest to Earth additional detail on the planet s surface may be visible Jupiter is 11 times the ...

Page 15: ...e 3 Helpful Charts a Latitudes of the World To aid in the polar alignment procedure previously described in this manual 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 Northern hemisphere observers N If your site is over 70 miles 110 km north of the listed city add one degree for...

Page 16: ...N Frankfurt Germany 50 N Glasgow Scotland 56 N Helsinki Finland 60 N Lisbon Portugal 39 N London England 51 N Madrid Spain 40 N Oslo Norway 60 N Paris France 49 N Rome Italy 42 N Stockholm Sweden 59 N Vienna Austria 48 N Warsaw Poland 52 N SOUTH AMERICA City State Latitude Asuncion Paraguay 25 S Brasilia Brazil 24 S Buenos Aires Argentina 35 S Montevideo Uruguay 35 S Santiago Chili 34 S ASIA City ...

Page 17: ...rius Canis Major 06h45m 16 43 Winter Aldebaran Taurus 04h35m 16 31 TELESCOPE MAINTENANCE AND SERVICING 1 General Maintenance The ETX Telescope is a precision optical instrument designed to yield a lifetime of rewarding applications Given the care and respect due any precision instrument the ETX will rarely if ever require factory servicing or maintenance Maintenance guidelines include a Avoid clea...

Page 18: ...arm summer day excessive ambient temperatures can damage the telescope s internal lubrication and electronic circuitry A set of three English format hex wrenches is provided with each ETX Astro Telescope These wrenches are used as follows Small wrench 050 Use the small wrench to tighten the set screws of any knobs which may loosen e g the Dec Slow Motion Control knob Focus knob R A Lock R A Slow M...

Page 19: ...ice If you have a question concerning your ETX telescope call Meade Instruments Customer Service Department at 949 451 1450 or fax at 949 451 1460 Customer Service hours are 8 30AM to 4 30PM Pacific Time Monday through Friday In the unlikely event that your ETX requires factory servicing or repairs write or call the Meade Customer Service Department first before returning the telescope to the fact...

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