User manual

Use of the moon ﬁ lter

If the image of the moon is too bright for you,

you can screw the green moon ﬁ lter into the

bottom of the thread of the eyepiece. Then

you can set the eyepiece normally into the

zenith mirror.

The image that you see by looking through

the eyepiece is now greenish. The moon ap-

pears less bright, and so observation is more

pleasant.

Which eyepiece is right?

First of all, it is important that you always choose an eyepiece with the highest focal width for

the beginning of your observation. Afterwards, you can gradually move to eyepieces with smal-

ler 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 magniﬁ -

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 is also depends on the focal width of the telescope tube. This te-

lescope contains a telescope tube with focal width of 700 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:

700 mm / 20 mm = 35 x magniﬁ cation

To make things simpler, I’ve put together a table with some magniﬁ cations:

Telescope tube

focal width

Focal width of

eyepiece

Magniﬁ cation with 1.5x inverting lens

700 mm 24 mm 29x 43,5x

700 mm 20 mm 35x 52,5x

700 mm 12,5 mm 56x 84x

700 mm 6 mm 116x 174x

700 mm 4 mm 175x 262,5x