Orion SPACEPROBE 130ST EQ Manuel d'utilisateur télécharger pdf (Page 10)

tion of the secondary mirror (and your eye) centered in the

reflection of the primary mirror, as in Figure 8a. If anything is

off-center, proceed with the following collimating procedure.

The Collimation Cap and Mirror Center Mark

Your SpaceProbe 130ST EQ comes with a collimation cap.

This is a simple cap that fits on the focuser drawtube like a

dust cap, but has a hole in the center and a silver bottom.

This helps center your eye so that collimating is easy to per-

form. Figures 8b through 8e assume you have the collimation

cap in place.

In addition to providing the collimation cap, you’ll notice a

tiny ring (sticker) in the exact center of the primary mirror.

This “center mark” allows you to achieve a very precise col-

limation of the primary mirror; you don’t have to guess where

the center of the mirror is. You simply adjust the mirror posi-

tion (described below) until the reflection of the hole in the

collimation cap is centered inside the ring.

NOTE: The center ring sticker need not ever be removed

from the primary mirror. Because it lies directly in the

shadow of the secondary mirror, its presence in no way

adversely affects the optical performance of the tele-

scope or the image quality. That might seem counterin-

tuitive, but it’s true!

Aligning the Secondary Mirror

With the collimation cap in place, look through the hole in

the cap at the secondary (diagonal) mirror. Ignore the reflec-

tions for the time being. The secondary mirror itself should

be centered in the focuser drawtube, in the direction parallel

to the length of the telescope. If it isn’t, as in Figure 8b, it

must be adjusted. Typically, this adjustment will rarely, if ever,

need to be done. It helps to adjust the secondary mirror in a

brightly lit room with the telescope pointed toward a bright

surface, such as white paper or wall. Placing a piece of white

paper in the telescope tube opposite the focuser (i.e., on the

other side of the secondary mirror) will also be helpful in col-

limating the secondary mirror. Using a 2mm Allen wrench,

loosen the three small alignment setscrews in the center

hub of the 3-vaned spider several turns. Now hold the mirror

holder stationary (be careful not to touch the surface of the

mirrors), while turning the center screw with a Phillips head

screwdriver (Figure 9). Turning the screw clockwise will move

the secondary mirror toward the front opening of the optical

tube, while turning the screw counter-clockwise will move the

secondary mirror toward the primary mirror.

When the secondary mirror is centered in the focuser draw-

tube, rotate the secondary mirror holder until the reflection

of the primary mirror is as centered in the secondary mirror

as possible. It may not be perfectly centered, but that is OK.

Now tighten the three small alignment set screws equally to

secure the secondary mirror in that position.

Figure 8. Collimating the optics. (a) When the mirrors

are properly aligned, the view down the focuser drawtube

should look like this (b) With the collimation cap in place,

if the optics are out of alignment, the view might look

something like this. (c) Here, the secondary mirror is

centered under the focuser, but it needs to be adjusted

(tilted) so that the entire primary mirror is visible. (d) The

secondary mirror is correctly aligned, but the primary mirror still needs adjustment. When the primary mirror is correctly aligned, the “dot” will

be centered, as in (e).

drawtube

Reflection

of primary

mirror clip

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

Commentaires sur ces manuels

Pas de commentaire

Orion SPACEPROBE 130ST EQ Manuel d'utilisateur Page 10

Commentaires sur ces manuels

Produits connexes et manuels pour Dispositifs optiques Orion SPACEPROBE 130ST EQ