background image

5. Note the dotted line and arrow extending from the telescope tube in Fig. 
8. This line defines the telescope's polar axis. Lift the entire telescope, 
including tripod, and place the telescope on a tabletop so that this axis is 
pointed due North. For example, if you know the location of Polaris, the 
North Star, then point the telescope directly at Polaris. (Fig. 9) 

Note: Observers located in the Earth's southem hemisphere (e.g., South 
America, Australia, etc.) should point the telescope's polar axis due South.

 

6. From this point on, only move the telescope using the R.A. and Dec 
controls. Any other movement of the telescope will nullify the polar alignment procedure. 

Polar alignment of the telescope thus requires two procedures: extending the center tripod leg to the correct 
latitude position and pointing the telescope's polar axis due North. 

The center tripod leg has a latitude range of from 27.5° to 42.5°. Observers located at latitudes higher than 42.5° 
may achieve equatorial alignment by placing the center tripod leg in the upper hole position (2, Fig. 3). Polar 
alignment may in this way be achieved to latitudes as high as 48°. Note, however, that the latitude scale on the 
center tripod leg no longer is valid when the leg is placed in the upper hole position. In this case the center tripod 
leg should be extended until the telescope's polar axis points to Polaris, or due North, an alignment obtained by 
sighting along the telescope tube with the telescope oriented as shown in Fig. 8. 

If the observing location is at latitudes below 27.5°, the telescope can be polar aligned by placing the center tripod 
leg in the lower hole position (4, Fig. 3). Again, polar alignment can be obtained by sighting along the telescope 
tube, per the orientation in Fig. 8, and extending the center tripod leg so that the telescope's polar axis points to 
Polaris. Polar alignment at latitudes as low as 22° may be achieved in this way. If your observing latitude is higher 
than 48°, the optional High-Latitude Tripod Leg, is available 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 alignment (particularly if your latitude requires that you use the upper or lower hole 
positions, (2 and 4, Fig. 3) for attachment of the center tripod leg) may be obtained by first orienting the telescope 
as shown in Fig. 8. Use the R.A. Slow-Motion Control (10, Fig. 1) to move the telescope so that the eyepiece is 
positioned as shown in Fig. 8. Then follow this procedure: 

1.  Align the telescope's optical tube by your eye so that it is parallel to the telescope's center tripod leg. Use 

the Dec Slow-Motion Control (16, Fig. 1) to make the optical tube and center tripod leg as nearly parallel to 
each other as your eye can detect, as shown in Fig. 8. 

2.  Lift the entire telescope, including tripod, and place it on the observing table so that the telescope's polar 

axis (dotted arrow in Fig. 8) is pointing due North. 

3.  While observing through the SP 26mm eyepiece of the main telescope, adjust the length of the center 

tripod leg until Polaris is visible in the eyepiece. Do not use the R.A. and Dec Slow-Motion Controls. 
Instead, use a combination of (a) lifting and turning the entire telescope (or nudging the position of one of 
the fixed tripod legs) and (b) adjusting the length of the center tripod leg to place Polaris in the center of the 
telescope's field. 

Although the above procedure is somewhat tedious (since the actual field of view of the main telescope with the SP 
26mm eyepiece in place is only about 1°), it is a worthwhile effort if fairly precise polar alignment is desired (e.g., if 
photography of the Moon or a planet is to be performed.) With Polaris placed in the center of the telescope's field, 
the telescope will be polar aligned within about one or two degrees - a level of alignment precision more than 
sufficient for almost any observing application. 

arrow) points due North.

 

 

Fig. 9: Locating Polaris

 

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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