SKY-WATCHER S11670 User Manual page 24

You will have to alternately loosen one and then compensate for the slack by tightening the other two. Stop when
you see all three mirror clips (Fig.s4). Make sure that all three small alignment screws are tightened to secure the
secondary mirror in place.
Aligning the Primary Mirror
Find the three locking screws at the back of your telescope and loosen them by a few turns.
Adjusting screw Locking screw
Hex bolt (Locking screw)
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.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.
24
If you see 3 large nuts protruding
from the back of your telescope
and 3 small Phillip's-head screws
besides them, the Phillip's-head
screws are the locking screws
and the large nuts are the
adjusting screws.
Adjusting screw
If you see 3 hex bolts and 3 Phillip's head screws, the hex bolts are
the locking screws and the Phillip's-head screws are the adjusting
screws. You will need an Allen wrench to adjust the locking screws.
Locking screw
Adjusting screw
If you see 6 Phillip's-head
screws but 3 protruding from
the back of your telescope, the
3
locking screws and the ones
next to them are adjusting
screws.
Fig.s5
Secondary
mirror
Primary mirror
Fig.s6
Both mirrors aligned
with collimating cap in
protruding screws are
Stop and keep your
hand here
Both mirrors aligned with
eye looking in focuser