8
Terrestrial Use:
Your telescope is a dual purpose model. It can be
used for astronomy, as well as for viewing objects
on land. When viewing terrestrial objects you will
want objects to appear both right-side up, and cor-
rectly oriented left to right, just as you see them with
your eyes.
To achieve correct orientation you will use the Im-
age Erector that is supplied with your telescope.
1) Remove the diagonal from your telescope.
(Fig. 5)
2) Insert the Image Erector into the focuser.
Then insert the 20mm. eyepiece. When you
look through the telescope you will find that
the image you see is right-side up and prop-
erly oriented.
3) For more magnification remove the 20mm.
eyepiece and replace it with the 4mm one.
About Magnification (Power):
1) You have seen that as you change eye
pieces objects appear closer or further away.
You are seeing the effect of changing magni-
fication, or power.
2) To determine the astronomical magnification
of your telescope, divide the telescope’s
600mm. focal length by the focal length of
the eyepiece in use. Using this formula you
will see that the 20mm. eyepiece gives 30
magnifications (written 30X) and the 4mm.
eyepiece gives 150 magnifications (150X).
3) During terrestrial use the Image Erector mul-
tiplies eyepiece magnification by a factor of
1.5X. Therefore the 20mm. eyepiece gives
45X and the 4mm. eyepiece gives 225X.
EYEPIECE
IMAGE ERECTOR
Figure 5
