1) Brand selection

Phoenix Astronomical Telescope: The price is about 200RMB, which is cost-effective and suitable for beginners in astronomy.

Boguan Astronomical Telescope: The price is about 1200RMB, the workmanship is fine, and it is suitable for astronomy enthusiasts.

Celestron astronomical telescope: The price is about 2,000, with fine workmanship and good cost performance. Suitable for astronomy enthusiasts.

Sirius Astronomical Telescope: The price is about 4000RMB, it is powerful and suitable for astronomy enthusiasts.

Jiehe Astronomical Telescope: The price is about 300RMB. Strictly speaking, it should be a viewing telescope or a target telescope. If you focus on sightseeing and astronomy as a supplement, then Jiehe is a good choice. Basically, the Jiehe series comes with a special handbag, which is convenient for going out, feels good in hand, and is cost-effective.

2). Model selection

There are many criteria for model selection, such as aperture, focal length, focal ratio, magnification, coating, finderscope, equatorial mount and other parameters.

The various parameters are dazzling. For beginners, don’t be afraid. Let’s just grasp the main contradiction: one is the focal length, and the other is the caliber.

The models of astronomical telescopes are named after these two parameters, generally: focal length/aperture: such as 700/76, 1000/114; aperture/focal length: 76/700, 114/1000, etc.

That is, the larger the focal length and diameter, the better and more expensive it is. In other words, the thicker and longer the tube, the better and more expensive it is^_^.

3) About the equatorial mount

Another important point is the EQ, which stands for the equatorial mount.

Because celestial bodies are constantly moving, an equatorial mount allows the telescope to move with the stars, making observation easier.

The price of the same model with and without an equatorial mount is quite different. You can choose one according to your own psychological price and actual needs.

4) Magnification

The magnification of an astronomical telescope mainly depends on two focal lengths, namely the objective lens focal length and the eyepiece focal length. For a telescope, the focal length of the objective lens remains unchanged, but the focal length of the eyepiece can be flexibly combined. The calculation formula is: objective lens focal length/eyepiece focal length = multiple. Among them: objective lens focal length/eyepiece focal length * several times Barov multiple = maximum multiple.

5), a few notes

The items sold are all genuine.

The astronomical telescopes sold by Sirius have a 3-year warranty, and the rest have a 1-year warranty.

2. How far a telescope can see:

The resolving power of a telescope involves several factors: 1. The observation environment, light intensity, atmospheric stability and transparency, etc. 2. The telescope Lens coating technology, light transmittance, etc. 3, the observer's corrected vision status, and the degree of proficiency in using the telescope. These three aspects are basically uncertain. If we only consider the resolving power of the telescope itself, generally speaking, telescopes with larger diameters and higher magnifications have higher resolving power, and mirrors with better coatings have higher resolving power. It needs to be particularly emphasized that the magnification of the telescope is only one of the many related factors that affect the resolution. It is not advisable to blindly pursue large magnifications

3. The choice of telescope:

Size and weight: If you need to carry the telescope for a long time, a lightweight model is a good choice.

User's eye distance: Most telescopes generally have a device that can adjust the eye distance to facilitate the user to see things through the telescope, but wearing glasses is more or less inconvenient; therefore it is best to choose The eyepiece is equipped with a foldable soft rubber ring that can be adjusted to the correct eye distance for clearer vision.

Do you need waterproofing? If your outdoor activities will be close to the water, require long-term walking, or the weather is changeable, you can choose a waterproof and nitrogen-filled telescope

Generally, telescopes are designed to be used during the day, so the telescope The larger the exit pupil, the clearer you can see and the more suitable it is for situations with poor lighting.

The optical quality of the telescope is directly proportional to the price, and the aperture of the telescope is directly proportional to the volume!

4. Why can’t many friends see anything when they first start using astronomical telescopes?

Answer: After the installation is correct, the normal light observed in the eyepiece is: white light during the day and white light at night. Black light, why can’t we see the target? Because astronomical telescopes have the characteristics of high magnification, the magnification and the field of view (observable range) are inversely proportional. Due to the high magnification and small field of view, it is difficult for novices to master the skills of finding targets. , don’t worry if the target cannot be seen through the telescope. 1. Are all the protective covers open? 2. Have you installed the lowest magnification (longest focal length) eyepiece? 3. Have you found the target? (This is the most important step) 4. Have you adjusted the focus carefully? After solving the above 4 problems, do not observe through the glass window at the same time. You should be able to observe normally.

Finding the target is a prerequisite for telescope observation. Only when the target enters the telescope can it be observed. Due to the magnification of the astronomical telescope It is relatively high, and the field of view is relatively small. To find the target, you must go from near to far, from large to small. At the same time, you must learn to use the finder to find the target quickly, which requires more practice.

5. Under what circumstances are 1.5X erect mirror and 2/3X extender used?

Answer: 1.5X is an erect mirror, its function is to magnify 1.5 times and Invert the image again. It is suitable for close observation. The erect mirror is used to correct the inverted image into an erect image. It is generally used when observing ground targets, and is not necessary for observing the sky. What the refractor observes is a normal mirror image of left and right opposite up and down. If a 1.5X erect mirror is added, the up and down will be reversed. Therefore, it is useless to use 1.5X on a refractor. Use a 1.5X erect mirror on a reflector to obtain a mirror image.

The 2X/3x Barlow extender is a 2/3x magnifying glass. It is recommended to use it when the target contrast is large and the brightness is sufficient. .

Note that when 1.5X and 2X/3X are used, due to the increase in the number of lenses and the increase in magnification, the energy of the light passing through each lens will be reduced, and the observed target will be larger than without it. These mirrors should be darker and the clarity will be reduced. Pay attention to the brightness, contrast and distance of the object. When observing, you should mainly be satisfied with yourself.

6. Why are the images of celestial objects sometimes not stable? ?

Answer: One reason it takes time to see detail is the Earth's unstable atmosphere. Star images always appear to twinkle and boil under high magnification due to the faint but ever-present thermal currents above us.

The intensity of this flickering - known as atmospheric seeing - changes every night or even every minute, especially for nebulae and star clusters in deep sky. This requires great patience and confidence on the part of the observer. It is the so-called "astronomical exploration". All human explorations require a certain price.

7. How to observe celestial phenomena?

Answer: Some friends have installed astronomical telescopes and immediately Wanting to observe all celestial phenomena, this idea of ??"reaching the sky in one step" is unrealistic. The celestial objects we can observe are constantly moving, and even the stars show different scenery with the changes of the seasons. As a first contact with astronomy, Friends who observe must have long-lasting patience and great confidence.

A. A certain basic knowledge of astronomy is required. The learning CD provided by this store can help friends get started.

B. Be sure to know the current astronomical forecast. You can browse it in the introduction of this store. This is the so-called "never fight an unprepared battle".

C. Many friends use it here The astronomical telescope I purchased has observed many astronomical phenomena, which shows that learning and hard work must be fruitful. The key lies in "persistent efforts" to practice.

The astronomical telescope provides the hardware for observing celestial bodies, and Celestial objects show different effects depending on their position and distance. The observation effects of astronomical telescopes of different models and prices are also different. Astronomical telescopes are generally used to observe the sunspots and flares of the sun, the ring mountains on the moon, the profit and loss of Venus, The rings of Saturn, the stripes and satellites of Jupiter, the polar caps on Mars, the Andromeda Nebula, the Orion Nebula, etc. As for the operation of the "software", you need to learn and pay for it yourself! I believe that friends will definitely succeed through learning and practice!

8. Explanation of the names of some astronomical telescope accessories:

¤Eyepiece: H20/H12.5mm/SR4mm/K25/K10.PL25 /PL20/PL12.5/PL10/PL6.5/PL4

The eyepiece is the terminal of an astronomical telescope and the final imaging accessory for observers to observe directly. Commonly used ones are:

Huygens eyepiece (H)

Rasden eyepiece (SR)

Kenel eyepiece (K)

Prosser eyepiece (PL)

The letters represent the type of eyepiece, and the numbers represent the focal length of the eyepiece. When the focal length of the objective lens remains unchanged, the focal length and magnification are in an inverse relationship. Telescope magnification = focal length of the objective lens/focal length of the eyepiece.