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60908_EN_Instruction Manual_REV_A
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Most Newtonians have three sets of two
collimation screws on the primary mirror cell, one
adjustment screw and one locking screw each.
3. Remarks.
You do not need to worry about
adjusting the collimation screws of your telescope!
You cannot damage anything. The worst case is
that you will end with a decollimated telescope
and have to start all over again.
If possible, do the collimation in bright daylight. The last step (primary collimation) can also be done at night (using a torch to
shine into the opening of the Collimating Eyepiece), but this is less straightforward than collimating during the day and needs
more practice.
Try to have two people available for carrying out primary collimation. One to adjust the collimation screws and the other to
look into the Collimating Eyepiece and say ”better“ or” worse“. With practice, you will be able to collimate the primary in just
one minute.
If you are familiar with collimation, you may wish to try this experiment: roughly decollimate your scope-like in Picture 5 and
observe a star. You will notice a comet-shaped star-image instead of a pinpoint. This is ‘coma’, the main off-axis aberration
with Newtonian telescopes. Any time you see such an asymmetric star image in you telescope, you will know that it is time to
collimate it!
4. Refractors.
If you own a refractor with collimation screws on the lens cell, you can also use your Collimating Eyepiece here.
Leave the front cover on the lens and slide the Collimating Eyepiece into the 1.25“ focuser. If you shine a powerful torch into
the opening, you will see ring shaped reflections from the lens surfaces, but these reflections are rather difficult to see. If the
reflections are not concentric, you can use the collimation screws to centre them.
Be aware that the reflections react very sensitively to adjustments with the collimations screws. It is a good idea to try to
collimate your refractor only when notice distorted star images when observing the night sky!
We wish you clear skies with your freshly collimated telescope!
5. Characteristics.
Weight
: 75 g;
Dimension:
Diameter 28 mm; Height 84 mm;
Material:
Anodized aluminium;
Recommended for:
Newtonians and Refractors.
1.
Adjustment screw
2.
Locking screw
Picture 7. Primary mirror cell.
