ASTRODEVICE TC 900, Руководство пользователя

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Tilt adjustment
Mechanically, the tilt adjustment process is very simple and obvious. All you
have to do is turn the screws S1, S2 and S3 (fi g. 1), thereby moving the camera
away from or closer to the telescope. Using a 2 mm hex wrench and turning the
respective screw clockwise, you move the camera away from the telescope, while
turning it counterclockwise brings it closer. Since the three points unambiguously
determine a plane, the deviations at the three points unambiguously determine
the plane in which the sensor is located.
Preliminary remarks
There are very many variables on which tiltt can depend. Sometimes it is related
to the camera, sometimes to the adapter, sometimes to the telescope. Sometimes
it is due to a dimensional mismatch between accessories, sometimes to an optical
defect. Sometimes an image that is confusingly similar to a tilt image is actually
an astigmatism image. Here we are dealing with such a large number of possible
variants that it is impossible to give a single algorithm of operation that would
be eff ective in all cases. The success of the correction depends largely on how
much we know about the actual cause of the aberration. With this knowledge, we
can guide the correction in a predictable direction, rather than just haphazardly
turning the screws, becoming disappointed not only with the result, but also with
the possible impermanence of the eff ect.
That’s why you should get as much data as possible about what exactly you’re
dealing with before making adjustments.
Here are some quick tips that you should take into account:
1. Most often, tilt is caused by the inaccuracy of the connection between the
camera and the telescope. The culprit then is the connector, threads or
accessories between the telescope and the camera. Their mounting planes may
be uneven, unparalell, there may be inaccuracies involving the tightening of
the threads, etc. You can diagnose this type of tilt by changing the confi guration
of the camera-telescope connections. The feature of this type of tilt is that it
changes, depending on the force of tightening the elements, their order, used
accessories, etc.
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