Celestron 22470 INSTRUCTION MANUAL

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16 I ENGLISH

For the 10” Dobsonian, you won’t need any tools

to tilt the primary mirror. Instead, simply adjust the

thumbscrews. Three of the thumbscrews are locking

screws, while the other three thumbscrews adjust the

tilt.

a. Start by loosening all three of the locking

thumbscrews (Figure 21).

Figure 21: For the 10” Dob, there are three spring-loaded collimation

thumbscrews that adjust the tilt of the primary mirror. The other three

thumbscrews lock the mirror in place once tilt adjustments are completed.

b. Adjust the collimation thumbscrews one at a time.

Each collimation thumbscrew is spring-loaded, so

you can rotate it clockwise or counterclockwise.

c. Continue adjusting the screws until the reﬂection

of the secondary mirror is centered within the

reﬂection of the primary mirror.

d. Re-tighten the three locking thumbscrews until

snug.

e. When you are ﬁnished, the view through the

collimation cap should look like Figure 16.

Your telescope’s optics are now aligned and ready for use.

You can also conﬁrm a telescope’s alignment at night by

pointing the telescope at a bright star at high magniﬁcation.

Center the star in the ﬁeld of view and slightly defocus the

star—it should appear like a circle with a hole in the middle.

(The “hole” is the shadow from the secondary mirror.) If the

hole is not centered within the circle, you’ll need to make

additional adjustments to collimation (Figure 22).

GOOD COLLIMATION NEEDS ADJUSTMENT

Figure 22: You can check collimation by defocusing a bright star centered

in the ﬁeld of view and checking to see if the “hole” is centered. If it is not

centered, some adjustment is needed.

TRANSPORTING

Transporting the StarSense Explorer Dobsonian is

easy, especially considering its size. First, remove the

telescope tube from the base by loosening the altitude

tensioning knob and lifting the telescope tube. You can

carry the tube and the base separately by their integrated

carry handles. The handles are positioned to balance the

load, so neither component should be awkward to carry.

LOCKING

THUMBSCREWS

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Celestron 22470 StarSense Explorer 8" Smartphone App-Enabled Dobsonian Telescope