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5

8.) Insert the low power eyepiece marked “H20mm” into the diagonal mirror. Tighten the 

small chrome set screw by turning it clockwise to hold the eyepiece securely in place. 
(Picture #5) 

 

 
 
 
 
 
 
 
 

(Picture #5) 

 
 
THE ALTAZIMUTH MOUNT 

 
This telescope is fitted with an Altazimuth mount. “Altitude" refers to the vertical, or “up and 
down” movement of the telescope, while "Azimuth" refers to the horizontal, or “side-to side” 
movement. 
 
 

ABOUT MAGNIFICATION 

 

The magnification power of a telescope 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, determine the magnification power. To calculate the power of your 
telescope with any particular eyepiece, simply divide the focal length of the telescope 
(360mm) by the focal length of the eyepiece (indicated in “mm” on the eyepiece collar). 
 
Example

:            360mm focal length (tube)                 = 18X magnification power 

                        20mm focal length (eyepiece) 

 

The two interchangeable eyepieces included, provide the following magnification powers: 

 

 

    

  

 

 

Eyepiece           

Power 

 

      

 

 

 

20mm           

18X 

 

4mm               

90X  

 
The level of magnification required depends on the object being observed. 
 
A lower magnification power with a wider field of view is good for observing galaxies and 
nebulae. Higher magnification powers should only be used for highly detailed observations of 
the moon, Jupiter, and Saturn, or any object that is extremely bright 
 
 
 
 

Summary of Contents for OR7090

Page 1: ...orbitor 50mm 90X Refractor Telescope Instruction Manual Instruction Manual Part 261668...

Page 2: ...telescope without adult supervision Here are the main parts of your telescope A 20mm Eyepiece B Focus Tube C Telescope Tube D Dew Shield E Diagonal Mirror F Focus Knob G Azimuth Lock Knob H Objective...

Page 3: ...as a terrestrial land telescope to study birds animals and landscapes at a distance To obtain the best performance from your new telescope please read this manual carefully and completely ASSEMBLY 1...

Page 4: ...altitude lock knob clockwise into this nut until it stops Picture 3 5 Turn the tightening knob on the tripod mount clockwise until it stops The telescope is now securely attached to the tripod 6 Loos...

Page 5: ...the focal length of the telescope determine the magnification power To calculate the power of your telescope with any particular eyepiece simply divide the focal length of the telescope 360mm by the f...

Page 6: ...widest angle with the brightest and sharpest views To adjust the angle of the telescope loosen the azimuth lock knob by turning it counterclockwise Adjust the telescope to the desired angle then tigh...

Page 7: ...onth to month The Internet is also an excellent source of information starcharts maps and more The popular and more familiar constellations often provide the easiest landmarks to help find the planet...

Page 8: ...h your telescope even after searching for an object to view it is very likely that you are using an eyepiece that is too powerful To solve this problem Always start with the lowest power eyepiece firs...

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