Celestron 94182 Schnellstart-Handbuch

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Collimation Eyepiece- Model #94182

Collimation is the process of aligning the optical

Using the Collimation Eyepiece

axes of all the optical elements in a

telescope.

When

properly collimated, all the mirrors (or lens) will be

1. Remove the eyepiece or any other accessory from

centered and angled so that the light entering the

the focuser and rack the focuser all the way in

telescope will form the sharpe

pessible-irnag

towards the tube.

Collimation

Eyepiece

is a

combination of a "sight tube"

and a

"Cheshire eyepiece."

The sight tube portion of the

Collimation

eyepiece

has

cross hairs to accurately define

the center of the optical

axis,

and is used to make sure that

the

secondary

mirror

centered directly under the

focuser. The Cheshire portion

of the eyepiece has a polished

45°

angled

element

that

reflects light from the cutout

hole in the side of the barrel

down

into

the

optical

path.

The

polished

flat

element

projects a bright ring of light,

providing a target for aligning

the primary mirror.

Identifying What You See.

Figure 2 represents what

properly

collimated

Newtonian telescope would

look like when looking into the

focuser tube with the eyepiece

Sight Hole

Polished 45°

Reflective Flat

1%" Barrel

Crosshairs

Figure 1

Insert the Collimation

Eyepiece into the foe user far

enough that the bottom edge

of the barrel appears slightly

larger than the outer edge of

the secondary mirror when

looking through the sight

hole.

3. Rotate the eyepiece so

that the cutout on the side of

the barrel is towards an

external light source. (If

collimating at night, shine a

flashlight

through

the

cutout).

~e~

p J)int

cutout side of the eyepiece

at or near the sun; serious

and instant eye damage

can result.

4. Look into the sight hole

determine

the

secondary

positioned

directly under the focuser

tube.

- -

The center of the

secondary mirror should be

positioned directly under the

intersection of the cross

removed.

The figure labels the major parts of a

hairs of the Collimation Eyepiece, it will need to

typical Newtonian telescope.

However,

what you

be adjusted.

This

usually done by rotating the

see when looking through your

teles~01'e

will

threaded rod that holds the secondary holder.

depend on the manufacturer of the telescope. For

Additionally, the threaded rod can slide up and

example, many Celestron models use a single

stalk

down through the spider for adjustments in the

to support the secondary mirror instead of a four

other axis.

To adjust a stalk-type secondary

v~e

spider. Therefore, when looking through the

holder, there is usually a center boit that can be

focuser you would see a single vane leading out to

loosened to allow rotation of the secondary

holder.

the secondary mirror as opposed to four vanes.

5. Next, you need to adjust the tilt of the secondary

mirror so that

the entire

reflection

the primary

mirror is visible in the secondary mirror. Use the

hairs. If the secondary is not centered in the cross

Celestron International, 2835 Columbia

Street,

Torrance, CA 90503· Phone (310) 328-9560 • Fax (310) 212-5835