How to use the astronomical telescope

Operation process of the astronomical telescope:
If the telescope is equipped with an equatorial mount, the right ascension and declination axis balance of the telescope must be adjusted.

  • 1. Adjust the optical axis of the main scope and the finder scope to be parallel

After installing the telescope, we first choose a relatively large building target, such as a chimney, an outdoor unit of an air conditioner, etc. Don’t worry about the star finder, first choose the eyepiece with the largest F value of the telescope and install it on the main scope (usually 20mm or 8mm), use the main scope to slowly find the object you are looking at. Here is an example of the logo on the outdoor unit of an air conditioner , We choose large objects so that the main scope can be easily found.

  • 2. Adjust the finder scope

The main scope has already set the image, let’s adjust the finder scope below. Turn the three screws on the finder scope to adjust slowly, and adjust the image in the center of the main scope to the center of the reticle cross hair of the finder scope as much as possible. Be patient. This may be the most impatient time.

When the optical axes of the two scopes are parallel, we can observe all objects.

The specific operations are as follows:

After moving to the approximate position, first observe and aim through the finder mirror, and place the object to be observed in the middle of the cross of the finder mirror (rotating the tripod, not the finder mirror). After reaching the center, observe the main mirror. You will find that the observed object appears in the field of view of the primary mirror honestly, and the focus will become clear when you adjust the focus. This is because the optical axis is parallel.

There are generally two barrels on an astronomical telescope. The larger one is the main mirror, which is used to observe the target; the smaller one is called the star finder, which is used to find the target, and is also called the sight. The eyepiece is a separate individual and is an item that determines the magnification. The eyepiece will have an F value, which is the focal length of the eyepiece. Dividing the F value of the primary lens by the F value of the currently used eyepiece is the current magnification.

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