Bushnell 78-9675 业主指南

 
3.  Locate  the 

  and 

  Loosen  the  thumb  screw  located  on  the

 and slide the 

 onto the 

 then and tighten thumb screw to

secure  the   

.  Thread  the 

  into  the  hole  located  directly  below  the

 Make sure that the shaft is securely  locked into mount.

 
4.  Insert 

 into focusing tube to begin viewing.

 

1.  You should always start viewing with the lowest power eyepiece, which in this case is the 20 mm lens.

Note: the base power of each eyepiece is determined by the focal length of the telescope objective lens,
which for this model is 900 mm.  A formula can be used to determine the power of each eyepiece:

telescope OBJECTIVE lens focal length   EYEPIECE focal length = MAGNIFICATION (e.g. Using the

20 mm lens, the calculation would look like this:   900 mm 

÷

 20mm = 45x or 45 power.)

 
2.  Included with this telescope is a Barlow lens. Barlow lenses are used to double or triple the power of your

telescope. Place your Barlow between the focusing tube and the eyepiece. Using the example above,
your 3x Barlow lens would give you a total power of 135x or 135 power. (45 x 3 = 135x or 135 power)

1.  After selecting the desired eyepiece, aim main telescope tube at a land-based target at least 200 yards

away (e.g. A telephone pole or building). Fully extend focusing tube by turning 

 
2.  While looking through selected eyepiece (in this case the 20 mm), slowly retract focusing tube by turning

 until object comes into focus.

1.  Look through 

 

  and  establish  a  well-defined  target.  (see  focusing  telescope

section)   Tighten all lock knobs (Declination, Latitude, Right Ascension, Horizontal Axis and Cradle)

so

that telescope’s aim is not disturbed.

 

2.  Looking  through 

,  alternate  tightening  each

  until

crosshairs of 

 are precisely centered on the same object already centered in 

 field of view.

 

3.  Now, objects located first with the 

  will be centered in  the  field  of  view  of  the  main

telescope

.