Celestron STARSENSE EXPLORER 8 DOBSONIAN Manual De Instrucciones página 15

a. Adjust one set screw at a time. Make only small
adjustments.
b. If one set screw becomes too tight or too loose, make
adjustments to the other set screws to compensate.
2. Continue adjusting the set screws until the primary mirror
appears centered within the secondary mirror (Figure
19). When you are finished, make sure all three of the set
screws are snug.
Reflection of
secondary mirror
Figure 19: Continue making tilt adjustments to the secondary mirror until
the primary mirror reflection is centered as shown in the drawing above.
3. Next, adjust the tilt of the primary mirror until the reflection
of the secondary mirror is centered within the reflection
of the primary mirror.
For the 8" Dobsonian, use the 2.5mm hex key and
Phillips head screwdriver to tilt the primary mirror. There are
three pairs of collimation screws. Each pair works together
to adjust the tilt.
Edge of
secondary
mirror
Figure 20: For the 8" Dob, there are three sets of push-pull screws
in the mirror cell that adjust the tilt of the primary mirror. Loosen one
screw in the pair and tighten the other to adjust the tilt.
Reflection of
primary mirror
a. Adjust one pair of screws at a time. Start by
loosening one of the screws in the pair and
tightening the other (Figure 20).
b. If the mirror tilts opposite the desired direction,
loosen the screw that you previously tightened,
and tighten the other screw in the pair.
c. Once you have adjusted one pair of screws as
much as you can, move onto another pair of screws.
d. Continue adjusting until the reflection of the
secondary mirror is centered within the reflection
of the primary mirror. When you are finished, the
view through the collimation cap should look like
Figure 16.
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