Bresser PM-100 Instruction Manual page 6

Mounting the polar finderscope
Remove the LED illuminator from the finderscope (1, Fig. 1).
Insert the O-ring from the front onto the finderscope (8, Fig. 3).
Put the retaining ring (9, Fig.3) on the pole viewfinder and fix it with the 3
small cross-head screws (7, Fig.1). Tighten the screws evenly so that the pole
finder can still be turned in the holder with some resistance.
By tightening the cross-head screws evenly, a sufficiently precise adjustment
of the pole finder is made.
Now screw on the LED illuminator again.
Now fix the pole viewfinder to the photo mount (Fig. 2) using the 8mm fixing
screw (6, Fig.1) included in the scope of delivery.
Using the polar finderscope
Orient yourself towards the sky. To align your mount to the celestial pole
with the help of your polar finder scope, you need unobstructed view
towards the northern part of the sky (or to the south, if you are using the
telescope in the southern hemisphere, such as Australia).
The following procedure applies to aligning the telescope for the use on the
northern hemisphere, such as Europe or North America. Look for the con-
stellation „Big Dipper". The Big Dipper represents a part oft he constellation
„Big Bear (Ursa Major)". Depending on the season you can see the constella-
tion at different locations at dusk: in the winter it can be seen just above the
northern horizon, in spring halfway up in the north east, in the summer al-
most directly above in the north, and in the autumn in the north west. Figure
4 shows you the northern part oft he sky at dusk in the beginning of january.
The Big Dipper /Big Bear is located directly above the northern horizon. We
can spot the three stars that form the handle of the Big Dipper at the middle
left and two bright stars at the other end of the constellation (Fig. 6), one of
them beeing the star „Dubhe" in the upper right. We need those „rear" stars
to get tot he North Star (Polaris). If yopu prolong the line that is formed by
those two yellow stars oft he Big Dipper you will get tot he brightest star in
the constellation Little Dipper/Little Bear (Ursa Minor). This is the North Star
(Polaris).
The North Star may be located in the immediate vicinity oft he north celestial
pole, but it is not located directly at the pole.For this reason it does circle the
pole during the day/year like any other star that circle the celestial pole. We
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