Aligning The Primary Mirror - Dorr DANUBIA ATLAS 2000 Bedienungsanleitung

12.3

ALIGNING THE PRIMARY MIRROR

Find the three locking screws at the back of your telescope and loosen them by a few turns.
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If you see 3 large nuts protruding from the back of your telescope and 3 small Phillip's-head screws besides
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them, the Phillip's-head screws are the locking screws and the large nuts are the adjusting screws.
If you see 6 Phillip's-head screws but 3 protruding from the back of your telescope, the 3 protruding screws
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are locking screws and the ones next to them are adjusting screws.
If you see 3 hex bolts and 3 Phillip's head screws, the hex bolts are the locking screws and the Phillip's-head
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screws are the adjusting screws. You will need an Allen wrench to adjust the locking screws.
Now run your hand around the front of your telescope keeping your eye to the focuser, you will see the re-
flected image of your hand. The idea here being to see which way the primary mirror is defected, you do this
by stopping at the point where the reflected image of the secondary mirror is closest to the primary mirrors'
edge (Fig.s5). When you get to that point, stop and keep your hand there while looking at the back end of your
telescope, is there an adjusting screw there? If there is you will want to loosen it (turn the screw to the left) to
bring the mirror away from that point. If there isn't an adjusting screw there, then go across to the other side
and tighten the adjusting screw on the other side. This will gradually bring the mirror into line until it looks like
Fig.s6. (It helps to have a friend to help for primary mirror collimation. Have your partner adjust the adjusting
screws according to your directions while you look in the focuser.) After dark go out and point your telescope
at Polaris, the North Star. With an eyepiece in the focuser, take the image out of focus. You will see the same
image only now, it will be illuminated by starlight. If necessary, repeat the collimating process only keep the
star centered while tweaking the mirror.
13 | CLEANING YOUR TELESCOPE
Replace the dust cap over the end of the telescope whenever it is not in use. This prevents dust from settling
on the mirror or lens surfaces. Do not clean the mirror or lens unless you are familiar with optical surfaces.
Clean the finderscope and eyepieces with special lens paper only. Eyepieces should be handled with care,
avoid touching optical surfaces.
Adjusting screw
Fig.s5
Secondary mirror
Primary mirror
Fig.s6
Both mirrors aligned
with collimating cap in
27
Locking screw Locking screw Adjusting screw
Hex bolt
(Locking screw) Adjusting screw
stop and keep your
hand here
Both mirrors aligned
with eye looking in focuser