How do novices choose astronomical telescopes?

Having an astronomical telescope with excellent performance is the most basic requirement for every astronomy enthusiast, but for beginners, you should pay more attention to choosing the right astronomical telescope, or you will fall into the pit carelessly. Next, 5 1 Oshima teaches you how to buy astronomical telescopes from five aspects: optical type, performance parameters, bracket structure, optical quality and price grade. Beginners don't get started quickly! Optical astronomical telescope Refraction telescope Refraction telescope takes the lens as the main mirror, and the light refracts and converges at one point through the lens and the lens barrel, which is called "focal plane".

Advantages and disadvantages: simple and reliable structural design, convenient erection and use, basically no maintenance, and easy to check on the ground. The observation of the moon, planets and binary stars is excellent, but the color difference will reduce the resolution, and the large-aperture specifications are heavier and more expensive. Beginners suggest that medium and small caliber is appropriate.

Reflecting telescope used concave mirror as the main mirror. The light enters the bottom of the lens barrel, returns to the second mirror at the opening, and then changes direction and enters the focal plane of the eyepiece.

Advantages and disadvantages: Compared with the aperture of the same size, refractive and catadioptric telescopes have the lowest cost, are compact and reasonable, have good portability, have a focal length greater than 1000mm, have no chromatic aberration, and have excellent observation performance for weak deep space objects, but have large coma and astigmatism, so they are generally not suitable for ground applications and have high maintenance requirements.

Refractive telescopes, including Schmidt-Ka seglin and Maksutov-Ka seglin, use the combination of mirrors and lenses to fold the light path and form images.

Advantages and disadvantages: Combining the advantages of refractor and reflector, it can not only provide high definition and contrast of refractor, but also provide low chromatic aberration of reflector, which is the best combination of light gathering ability, long focal length, portability and economy. More details >>

The performance parameter aperture of astronomical telescope is the effective aperture of objective lens, which theoretically determines the performance of telescope. The larger the aperture, the stronger the focusing ability, the higher the resolution and the larger the available magnification. However, the larger the caliber, the larger the volume, which can generally be selected between 30 and 50.

Magnification is the ratio of the focal length of the objective lens to the focal length of the eyepiece. The larger the magnification, the larger the image you see. But the best magnification is 7- 12 times, so don't covet high magnification, otherwise the higher the magnification, the smaller and darker the observation field, and the lower the observation effect, especially the jitter caused by high magnification will be greatly increased.

The field of view is the angle of the sky area imaged by the telescope in the observer's eyes. The larger the field of vision, the wider, brighter and more comfortable the observation range will be. Regular military telescopes are generally designed with wide angle and large field of view, so it is recommended to buy a telescope with a field of view above110m/1000m.

The purpose of coated lens is to reduce reflection, increase light transmittance and improve observation brightness. The color of the coating depends on the optical material and design. The thinner the coating, the smaller the reflection, the better. Pay attention to distinguish those inferior red and green telescopes when purchasing. Most of the high-quality antireflection films are light blue, light purple and light yellow.

The support structure of astronomical telescope is flat, simple to use and low in adjustment accuracy. It can't track celestial bodies, and can only be used for simple starry sky observation, which is suitable for beginners as practitioners.

The equatorial telescope is used to offset the earth's rotation and track the movement of celestial bodies during observation; Complex structure and use, high adjustment accuracy; There are manual and electric magnetic declination meters. Manual declination tracker is suitable for special astronomical observation, and high-grade electric declination tracker is mostly used for special astronomical tracking photography and observation research.

On the basis of the equatorial plane, the longitude and latitude formula goes further, and the precise motor is controlled by the hand controller to find the celestial target, which can be tracked automatically after finding the target.

The optical quality of astronomical telescope can be observed by telescope during the day, and the outline of the building can be moved to 1/4 of the field of view. If the orange or blue-purple on the outline is particularly obvious, or the outline is particularly curved, the optical quality is poor. Look at the leaves in the distance. Generally, a telescope with a diameter of 60mm can see the blade Ye Jin 40 meters away. If you can't see clearly, the clarity is not enough.

At night, you can observe the stars with a telescope. If you see a star with obvious color, or a star at the edge of the field of vision dragging its tail, its length is twice that of a star, which means that the optical quality is very poor and it is not suitable for astronomical observation; This is easy to happen to low-priced small-brand telescopes in the general market, so everyone must observe and test them in person when buying.

The price of astronomical telescope is AstraZeneca, Guanbo and other entry-level telescopes with EQ suffix. The price is 500-2000 yuan, you can see the moon, Jupiter and Saturn, but the aperture is small, so you can't observe the deep space objects such as nebulae and galaxies well, which is more suitable for novices.

Cinda Xiaohei, Sirius Painter, Mead NG90 and other mid-range telescopes are priced at 2000-5000 yuan, with good optical performance and bracket stability. Generally, it is equipped with automatic star searching function, which is suitable for amateur astronomers with certain economic conditions.

High-end telescopes such as Star Trane C8, 8SE, Cinda SC8 and 16-inch DOB are more expensive, more than 10,000 yuan. They are sharp tools for observing planets, nebulae and other deep space objects, and are suitable for enthusiasts and professional astronomers.

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