IOptron MAK 150mm Handleiding

IOptron Niet gecategoriseerd MAK 150mm

Lees hieronder de đź“– handleiding in het Nederlandse voor IOptron MAK 150mm (5 pagina's) in de categorie Niet gecategoriseerd. Deze handleiding was nuttig voor 24 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld

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Instruction of Collimating
iOptron MAK150
Collimating is the process of aligning a telescope’s optics. Your Maksutov-Cassegrain's primary
mirror was aligned at the factory and should not need adjustment unless the telescope is
handled roughly. This manual contains information on how to test the collimation of your
telescope and instructions for proper alignment should that be needed. Do not attempt to
adjust the collimation screws, if you have not read through this manual and ready to do the
collimation.
Star-Testing the Telescope
Before you start adjusting the primary mirror of your telescope, make certain that it is actually
out of collimation by performing a star test.
Take your telescope out at dusk and let it acclimate to the outside temperature; this usually
takes 30-60 minutes. Like all closed Maksutov-Cassegrain systems, the thick meniscus lens
and primary mirror of the MAK150 will take some time to cool down to ambient temperature
when taken outdoors on a cold winter evening. The cooldown time can be shortened by
removing the three plastic plugs in the rear cell of the scope to expose the rear of the mirror cell
and placing the scope, meniscus end down, in an unheated garage or protected outdoor space
for an hour or so before observing. This will allow the warm air inside the tube to rise and
escape out the three one inch apertures in the rear cell.
When it is dark, point the telescope upwards at a bright star and accurately center it in the
eyepiece’s field of view. Slowly de-focus the image with the focusing knob. If the telescope is
correctly collimated, the expanding disk should be a circle (Figure 1). If the image is
unsymmetrical, the scope is out of collimation. Also, the dark shadow cast by the secondary
mirror should appear in the very center of the out-of-focus circle, like the hole in a donut. If the
“hole” appears off-center, the telescope is out of collimation.
If you try the star test but the bright star you have selected is not accurately centered in the
eyepiece, the optics will always appear out of collimation, even though they may be perfectly
aligned. It is critical to keep the star centered, so over time you will need to make slight
corrections to the telescope’s position in order to account for the sky’s apparent motion.
Figure 1. A star test will determine if a telescope’s optics are properly collimated. An unfocused view of a bright
star through the eyepiece should appear as illustrated on right if optics are perfectly collimated. If circle is
unsymmetrical, as in illustration on left, scope needs collimation.
Collimating
To collimate your telescope, remove the diagonal and eyepiece and look into rear opening of
the tube (also remove the dust cover from the front of the tube). This should be done indoors,
with the telescope pointed at a white wall in a well-lit room. Try to keep your eye centered with
respect to the rear opening of the tube as best as possible. Using a collimating eyepiece will aid
greatly in keeping your eye centered and is strongly recommended.
Alternatively, you can make a crude collimating tool out of a long 1.25” plastic lens cap, or an
empty, black plastic 35mm film canister. It will not have crosshairs, so it won’t be as precise, but
it will be better than nothing. Put a 1/16" to 1/8" diameter hole in the center. If you are using a
canister, cut 1/2" from the top lip of the canister. Insert the plastic collimating tool into the
focuser like an eyepiece with the bottom end out.
Figure 2. Lens cap
Once you are ready to collimate, look into rear opening of the tube. If your telescope is out of
collimation, it will resemble Figure 3a. A properly collimated scope will resemble Figure 3b. The
direction of the misalignment in your telescope may differ from Figure 3a, but the diagram will
give you the general idea of how things will look.
(a) (b)
Figure 3. If the telescope’s optics are out of alignment the view through the rear opening of the telescope will
resemble Figure 3a. With the optics properly aligned the view through the rear opening of the telescope will
resemble Figure 3b.
Remove 3 plastic screw covers on the rear cell of the optical tube. There are 3 sets of hex head
screws. Every set of screws includes a push screw and a pull screw, as indicated in Figure 4.
These alignment screws push and pull the mirror cell in order to tilt it. When you loosen or
tighten one of these screws, the other five screws must be adjusted as well to keep the proper
amount of pressure on the back of the mirror cell. By making slight adjustments, no more than a
ÂĽ turn, to how much the screws are tightened and loosened, you will change the alignment of
the primary mirror.
Look into the rear opening of the tube and locate the black crescent that shows the telescope is
out of alignment (Figure 3a). Note which way the front of the telescope would need to move in
order to “fill” that black crescent and resemble Figure 3b. Then look at the back end of the
telescope and locate the alignment screw that is in the direction that the front of the telescope
needs to move. For example, if the view in your telescope resembled Figure 3a, then you would
want to move the front opening of the telescope scope to the right. The alignment screw you
would start with would be the screw on the right as shown in Figure 4.
Before starting working on the screws, check if any of them is loose, especially the push screws.
Your actions now depend on whether this alignment screw is a push or pull screw. Please note
that you will be working to adjust the mirror cell by keeping all the screws not too loose and not
too tight. Follow the steps listed below carefully and refer to the figures that accompany them.
Figure 4. There are three sets of alignment screw. Each
set includes a push screw and a pull screw, indicated by
red and yellow arrows, respectively. The push screws
stand out higher from the surface than the pull screws.
Figure 5 If the view through the rear opening of the
telescope resembled Figure 3a, then the alignment
screw set you would start with would be this set of
screws marked by dashed yellow circle. The actual set of
alignment screw you would pick will vary depending on
which way the front opening would need to move in order
to “fill” the black crescent.
Notes:
• A 4mm metric Allen wrench should be used to turn the push or pull screw.
• Each time, the push or pull screw should be turned only a small amount, NO MORE
THAN ÂĽ TURN.

Product specificaties

Merk: IOptron
Categorie: Niet gecategoriseerd
Model: MAK 150mm

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