Sky-Watcher DOB10 - Manual (Page 11)

Aligning the Primary Mirror
Fig.l
Fig.n
Fig.m
Secondary
mirror
Primary mirror
stop and keep your
hand here
hex bolt inside
Both mirrors aligned
with collimating cap in
Both mirrors aligned with
eye looking in focuser
C
leaning your telescope
11
There are 3 hex bolts and 3 Phillip's head screws
at the back of your telescope, for 150mm/1200mm
and 200mm/1200mm the hex bolts are the locking
screws and the Phillip's-head screws are the
adjusting screws. For 254mm/1200 the flat headed
screws are the adjusting screws and the
thumbscrews are the locking screws (Fig.l). Use an
Allen wrench to loosen the hex bolts by a few
turns. Now run your hand around the front of your
telescope keeping your eye to the focuser, you will
see the reflected 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.m).
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 a 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.n. (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.
Replace the dust cap over end of telescope whenever not in use. This prevents dust from settling on mirror
or lens surface. Do not clean mirror or lens unless you are familiar with optical surfaces. Clean finderscope
and eyepieces with special lens paper only. Eyepieces should be handled with care, avoid touching optical
surfaces.
Please contact your dealer for technical support.
TECHNICAL SUPPORT
Locking screw
Adjusting screw