Celestron CGE1400 Manuel d'instruction - Page 10
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3.
Locate the collimation screw closest to where your finger is positioned. This will be the collimation screw you will
need to adjust first. (If your finger is positioned exactly between two of the collimation screws, then you will need to
adjust the screw opposite where your finger is located).
4.
Use the hand control buttons to move the de-focused star image to the edge of the field of view, in the same direction
that the central obstruction of the star image is skewed.
5.
While looking through the eyepiece, use an Allen wrench to turn the collimation screw you located in step 2 and 3.
Usually a tenth of a turn is enough to notice a change in collimation. If the star image moves out of the field of view in
Figure1-12
A collimated telescope
should appear
symmetrical with the
central obstruction
centered in the star's
diffraction pattern.
If seeing (i.e., air steadiness) is turbulent, collimation is difficult to judge. Wait until a better night if it is turbulent or aim to a
steadier part of the sky. A steadier part of the sky is judged by steady versus twinkling stars.
the direction that the central shadow is skewed, than you are turning the collimation
screw the wrong way. Turn the screw in the opposite direction, so that the star image is
moving towards the center of the field of view.
6.
If while turning you notice that the screws get very loose, then simply tighten the other
two screws by the same amount. Conversely, if the collimation screw gets too tight,
then loosen the other two screws by the same amount.
7.
Once the star image is in the center of the field of view, check to see if the rings are
concentric. If the central obstruction is still skewed in the same direction, then continue
turning the screw(s) in the same direction. If you find that the ring pattern is skewed in
a different direction, than simply repeat steps 2 through 6 as described above for the new
direction.
Perfect collimation will yield a star image very symmetrical just inside and outside of focus. In
addition, perfect collimation delivers the optimal optical performance specifications that your
telescope is built to achieve.
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