background image

 

7

10) Remove the plastic dust cap from the upper eyepiece port and insert the 25-mm 
eyepiece into the eyepiece holder. Tighten the small set screw to hold the eyepiece 
securely in place.

  (

See Fig. 15). 

 

 

 
 
 
 
 
 
 
 

 

 

(Fig. 15) 

 

11) Remove the plastic dust cap from the rear eyepiece port and attach the 45º 
diagonal prism by turning its collar clockwise over the threaded piece on the back of 
the main optical unit (See Fig. 16 and Fig. 17). 

 

     

 

 
 
 
 
 
 
 
 
 
 

                                         (Fig. 16)                                                  (Fig. 17) 

 
 
 
FINDER SCOPE ALIGNMENT 
 

Since a telescope has a narrow field of view by design, it can be challenging to locate a  
particular star or planet. For this reason the telescope is fitted with a low-power, wide- 
field miniature telescope called a finder scope. Always use your finder scope to locate  
the object you want to view FIRST. 

The finder scope should be aligned with the  

main telescope tube

 

before you begin using the telescope,

 in order that both  

scopes are positioned to always provide exactly the same angle and view.  
 
Note: Objects in the finder scope are upside down. This is normal and is common to all  
astronomical telescopes. 
 
 
 

Содержание NG90EQ

Страница 1: ...NG90EQ Maksutov Cassegrain Telescope Instructions and Owner s Manual...

Страница 2: ...lescope at the sun or even close to the sun Instant and irreversible damage can occur including blindness Do not let children use any telescope without adult supervision A B C D E F G H I J K L M N O...

Страница 3: ...ews of the moon s craters Jupiter s major moons and Saturn s rings in addition to dozens of galaxies star clusters and nebulae As a terrestrial land telescope the NG90EQ delivers great views of mounta...

Страница 4: ...op of each leg Position one of the three arms of the equatorial mount so that it fits between the leg sections Insert a bolt through the first tripod section then through the equatorial mount arm and...

Страница 5: ...nsert the two slotted chromed screws through the inner holes so that they engage with the two threaded holes on the underside of the main optical unit Tighten these with a screwdriver See Fig 4 Fig 4...

Страница 6: ...kwise to tighten it Then insert the threaded end of the counterweight rod into the equatorial mount and turn it clockwise until it stops See Fig 9 and Fig 10 Fig 8 Fig 9 Fig 10 8 Attach the long slow...

Страница 7: ...FINDER SCOPE ALIGNMENT Since a telescope has a narrow field of view by design it can be challenging to locate a particular star or planet For this reason the telescope is fitted with a low power wide...

Страница 8: ...ed with an advanced equatorial mount This type of mount moves the main optical tube in a circular fashion This is very important because it means that you can set up the NG90EQ to conveniently compens...

Страница 9: ...the declination slow motion control knob extending from the back of the telescope will counteract this slight error See Fig 22 Fig 22 A WORD ABOUT THE TWO EYEPIECE PORTS The NG90EQ is fitted with two...

Страница 10: ...escope indicates how much an image is enlarged or how big and close it appears to the viewer The focal length of the eyepiece combined with the focal length of the telescope determines the magnificati...

Страница 11: ...lessen these effects A common mistake made by many beginners is to start an observation session by placing the high power 9 mm eyepiece and the 3X Barlow lens in the telescope at the same time This i...

Страница 12: ...e to side and up and down The following directions will explain how to set up the equatorial mount to operate in such a manner Loosen the right ascension tightening knob See Fig 23 and carefully rotat...

Страница 13: ...ts you cannot remove the particles take the telescope to an optical professional for cleaning If you keep the dust caps on your telescope when it is not in use and avoid handling the lenses or mirrors...

Страница 14: ...ing you will see that they change position relative to each other and to Jupiter It is possible with careful planning to actually see one of the moons disappear either in front of or behind Jupiter as...

Страница 15: ...lescope objects in the sky appear to move Why is that When you observe an astronomical subject through a telescope the constant rotation of the Earth makes things appear to move across the viewing are...

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