SKY-WATCHER NEWTONIAN Manual de usuario

Collimation is the process of aligning the mirrors of your telescope

so that they work in concert with each other to deliver properly

focused light to your eyepiece. By observing out-of-focus star

images, you can test whether your telescope's optics are aligned.

Place a star in the centre of the field of view and move the focuser

so that the image is slightly out of focus. If the seeing conditions

are good, you will see a central of light (the Airy disc) surrounded

by a number of diffraction rings. If the rings are symmetrical about

the Airy disc, the telescope's optics are correctly collimated (Fig.a).

If you do not have a collimating tool, we suggest that you make a "collimating cap" out of a plastic 35mm

film canister (black with gray lid). Drill or punch a small pinhole in the exact center of the lid and cut off the

bottom of the canister. This device will keep your eye centered of the focuser tube. Insert the collimating cap

into the focuser in place of a regular eyepiece.

Collimation is a painless process and works like this:

Pull off the lens cap which covers the front of the telescope

and look down the optical tube. At the bottom you will see the

primary mirror held in place by three clips 120º apart, and at

the top the small oval secondary mirror held in a support and

tilted 45º toward the focuser outside the tube wall (Fig.b).

The secondary mirror is aligned by adjusting the central bolt

behind it, (which moves the mirror up and down the tube),

and the three smaller screws surrounding the bolt, (which

adjust the angle of the mirror). The primary mirror is adjusted

by the three adjusting screws at the back of your scope. The

three locking screws beside them serve to hold the mirror in

place after collimation (Fig.c. The screws on the back of your

telescope may be different.)

Aligning the Secondary Mirror

Point the telescope at a lit wall and insert the collimating cap into the focuser in place of a regular eyepiece.

Look into the focuser through your collimating cap. You may have to twist the focus knob a few turns until the

reflected image of the focuser is out of your view. Note: keep your eye against the back of the focus tube if

collimating without a collimating cap. Ignore the reflected image of the collimating cap or your eye for now,

instead look for the three clips holding the primary mirror in place. If you can't see them (Fig.d), it means that

you will have to adjust the three bolts on the top of the secondary mirror holder, with possibly an Allen wrench

or Phillip's screwdriver. You will have to alternately or loosen one and then compensate for the slack by tightening

the other two. Stop when you see all three mirror clips (Fig.e). Make sure that all three small alignment screws

are tightened to secure the secondary mirror in place.

Fig.b

Primary mirror

Support for

secondary mirror

Secondary mirror

Focuser

Fig.a

Corretly aligned Needs collimation

Fig.d

Primary mirror clip

Ignore the reflected

image for now

Fig.e

Primary mirror clip Primary mirror clip

Primary mirror clip

COLLIMATINGANEWTONIAN

Fig.c

Adjusting screw

Primary mirror

Mirror cell

Locking screw

Fig.f

Secondary

mirror

Primary mirror stop and keep your

hand here

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.f).

When you get to that point, stop and keep your hand there

while looking at the back end of your telescope, is there a

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.g. (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

teaking the mirror.

Sky-Watcher Telescope

www.SkywatcherTelescope.com

Fig.g

Both mirrors aligned

with collimating cap in Both mirrors aligned with

eye looking in focuser

Aligning the Primary Mirror

Find the three locking screws at the back of your telescope and loosen them by a few turns. Retighten the locking

screws when after the collimation.

hex bolt (Locking screw) 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.

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 Locking screw

If you see 6 Phillip's-head screws

but 3 protruding from the back of

your telescope, the 3 protruding

screws are locking screws and the

ones next to them are adjusting

screws.

Adjusting screw

Locking screw

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