About the purchase of astronomical telescopes. How to choose an astronomical telescope

The Boguan ED 80 560 APO refractor telescope is ok, I've seen it, but the focal length is relatively small.

1. The eyepiece should be bought with a high-grade one.

When buying an astronomical telescope, you should have 2-3 eyepieces. The eyepiece of a popular astronomical telescope is generally a Huygens eyepiece or a modified version of it made of two lenses. If you don't have a very good eyepiece, even if you use a very advanced objective, the results will not be very good.

Therefore, when buying eyepieces, you should buy high-grade eyepieces as much as possible within the scope of economic conditions.

There are various focal lengths of eyepieces, such as 4mm, 5mm, 6mm, 7mm, 8mm, and 9mm. In general, there are three types: low magnification, medium magnification, and high magnification. If it is a small-aperture astronomical telescope, the low magnification should be 20 40 times, the medium magnification should be 50 80 times, and the high magnification should be about 100 150 times.

2. The caliber of the finderscope should be larger.

The magnification of the small astronomical telescope finder is generally 5 12 times, and the actual field of view is about 6 14 degrees. The performance of the star finder greatly affects the observation ability of the astronomical telescope. The diameter of the finderscope should be as large as possible, preferably 30 50mm.

In addition, the role of the reticle is also important for the finderscope. When purchasing an astronomical telescope, you should carefully check that the finderscope does not come with a reticle device.

3. Choose a sturdy tripod.

If the optical performance of the astronomical telescope is very high, and there is no good tripod to support the instrument, its value will also be greatly reduced. Just imagine, how can a tripod that crumbles at the slightest wind give full play to the performance of the instrument. Because the field of view of an astronomical telescope is very small, especially at high magnification, the image will run out of view if there is a slight vibration, so it is difficult to see the object clearly.

So, when choosing a telescope, you should choose a sturdy tripod along with it.

4. Equatorial ceremonial stands and longitude and weft stands.

There are two types of support frames for astronomical telescopes: longitude and latitude stands and equatorial ceremonial stands. A bracket in which the lens tube can be rotated horizontally and vertically is called a warp and weft frame. The equatorial ceremonial stand is a bracket that rotates the lens barrel around the polar axis (right ascension axis) and around an axis perpendicular to the polar axis (declination axis), and each has its own strengths.

The structure of the longitude and latitude bracket of the rock brigade is simpler, lightweight, and dexterous compared to the equatorial ritual bracket, and the lens barrel can be rotated freely up and down, left and right, and even people who are not familiar with it can easily use this water support stand to face any starry sky position. It's a little tricky that in order to keep track of the stars that are out of view, you have to constantly move the instrument up, down, left and right. I'm afraid it won't feel so free for the observer.

The advantage of the equatorial ceremonial stand is that it can track the stars that come into view, as the mirror barrel pair rotates around the polar axis. It is also possible to install a camera to take spot shots of the stars in the starry sky. In order to take advantage of the advantages of the equatorial mount, the polar axis should be pointed squarely at the North Star.

In this way, even for unskilled people, it will not be too difficult to operate.