How do I choose an astronomical telescope?

According to your actual situation! For example, what do you want to see, choose the focal length of the astronomical telescope reasonably. Choose the focal length of the telescope, which is related to the celestial object you want to observe.

If you want to observe nebulae and look for comets, choose a short-focal length astronomical telescope; If you want to observe the moon and planets, choose a telephoto astronomical telescope; If you want to see binary stars, clusters, variable stars, and star clusters, it's best to choose a medium focal length astronomical telescope. Medium focal length lenses can be used at both ends, so they are more popular. Generally, a short lens means that the ratio of focal length to aperture is less than or equal to 6, and a long lens means that the ratio of focal length to aperture is greater than 15, and it is called a medium focal length lens in between.

But remember! It's not that the multiplier the better! The maximum magnification of an astronomical telescope shall not be greater than the aperture of the magnification objective (expressed in millimeters), and with a telescope with an aperture of 100 mm, it shall not be greater than 125 times in the case of moderate tranquility in atmospheric conditions.

Up to 190 times quieter at best; When the caliber is 200 mm, it must not be greater than 170 times when the atmospheric tranquility is moderate. At the best quietness, it can reach 340 times; In fact, for astronomy enthusiasts to observe bright objects, the maximum magnification can be up to two times, or even the aperture of the objective lens (expressed in millimeters). However, the telescope's oversized magnifications make the image larger and darker, while the jitter of the atmosphere is amplified, making the image more blurry.

And according to your personal budget, choose a large-aperture astronomical telescope as much as possible!

That's just a little advice! If you think you can, give it the best. If you want to buy a telescope, I can also introduce! that house I go to often! **And the quality is all you are satisfied with!

I want to buy a pair of telescopes in **, usually look at the scenery to see passers-by, generally 100 meters -5000 meters or so in the following Hello Boguan mirror is really good, 7, 8, 10 times is enough, military standards are this multiple. At.

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 good eyepiece, even if you use a very advanced objective, your observations won't be ideal.

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 astronomical telescopes is small, especially at high magnification, the slightest vibration will cause the image to run out of view, so it is difficult to see the object of observation.

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.

Compared with the structure of the equatorial ritual bracket, the warp and weft bracket is simple, lightweight, and dexterous, and the lens tube can be rotated up and down, left and right freely, 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.