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Which eyepiece is the right one?
First of all, it is important that you always choose an eyepiece (14) with the largest focal width
for the beginning of your observation. Afterwards, you can gradually move to eyepieces with
smaller focal widths. The focal width is indicated in millimeters, and is written on each eyepiece.
In general, the following is true: The larger the focal width of an eyepiece, the smaller the mag-
nifi cation! There is a simple formula for calculating the magnifi cation:
Focal width of the telescope tube / Focal width of the eyepiece = Magnifi cation
You see: The magnifi cation also depends on the focal width of the telescope tube. This telesco-
pe contains a telescope tube with a focal width of 600 mm. From this formula, we see that if you
use an eyepiece with a focal width of 20 mm, you will get the following magnifi cation:
600 mm / 20 mm = 35 times magnifi cation
To make things simpler, I've put together a table with some magnifi cations:
Telescope tube focal width
600 mm
600 mm
600 mm
600 mm
600 mm
20
Focal width of eyepiece
24 mm
20 mm
12,5 mm
6 mm
4 mm
Magnifi cation
25
30x
48x
100x
150x
Use of the moon fi lter
1$
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If the image of the moon is too bright for you,
you can screw the green moon fi lter (16) into
the bottom of the thread of the eyepiece (14).
Then you can set the eyepiece normally onto
the zenith mirror (15).
The image that you see by looking through
the eyepiece will now be greenish. The moon
appears less bright, and so observation is
more pleasant.
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