Is it better to have a larger aperture in a handheld telescope?

Of course, bigger is not better, and smaller is not better.

Too small is not good for comfort, too big, clumsy, and easily damaged.

A typical example of a diameter that is too small is 8x21, and a typical specification is also a typical specification for a large diameter that causes *** to be large, such as 7x50.

In fact, I feel that you don't have to be too rigid in asking this question, you can be flexible, completely according to your own preferences, as long as it is not too extreme. In fact, many things are important not to be too extreme, so there are few aspects that are "the more the better". I think it's more important not to look at these, but to have a systematic understanding of the relevant knowledge first.

As long as you have counted all these aspects, in fact, many times you don't have to be so serious in your choice. Like myself, there are big ones and small ones, different places use different ones, some occasions are suitable for portable ones, and some occasions are suitable for large ones.

Regarding the excessively large caliber, there are actually other shortcomings, but they will not be discussed here. It's too boring.

1. Looking at the parameters, the parameters of the telescope mainly include magnification, objective lens size, field of view, and the exit pupil distance.

2. Generally, telescopes are marked like this *40 and so on, in which the front number indicates the magnification, and the back number indicates the size of the objective lens, the unit is mm, 7*50 means that the magnification is 7 times, and the diameter of the objective lens is 50 mm.

3. Generally, it should not be more than ten times handheld, because the multiple is too high and it is easy to shake too much, and it is impossible to see the target clearly, especially the military, there are almost no more than ten times at home and abroad, so don't think that the military is the multiple is high, and those who boast thousands of times are fooling rookies. It is best for us to use 7-8 times for ourselves, because a high multiple generally means that the field of view is relatively narrow, and the field of view is very narrow.

4. I recommend the diameter of the objective lens of 40, because I use Boguan 8*40 myself, I feel that the volume and weight are already the limit, and it seems not small in my boy's hands, and it is really unbearable to hold it for a long time, but if you are specialized in stargazing, then it is recommended to use 7*50, because a larger objective lens diameter means a greater amount of light, and you can see fainter stars when you look at the stars at night, it is best to install it on a tripod, or the average person really can't move for more than 1 minute.

5. Brands, in addition to those internationally renowned brands (monthly income of less than 10,000 yuan can not afford to play) such as Nikon or something, recommend domestic products, because China's level in the field of optics is also very high, together with Panda and other brands are also very well-known, but later discontinued, now the best is the Boguan in Guangzhou, the Asian Games leadership seat is equipped with Boguan telescopes.

If you just look at the scenery and travel, 8*40 is already the limit, 7*50 is too big and heavy, and it is too "windy" to hang on the body. I bought Boguan 8*40** above 320, that section may be **, generally it may cost nearly 400 yuan, I asked for 650 yuan in a physical store in Guiyang.

Pure handwriting, I hope it can help your friend.

If you have any other questions, please feel satisfied.

From the perspective of specifications alone, the two parameters of aperture and multiples must be considered at the same time, the division of the two is the exit pupil, regardless of other indicators, the exit pupil determines the brightness of the telescope, and the telescope of about 5mm exit pupil can be used both during the day and at night. Mirror friends like to use a telescope of about 10 times, one is moderate weight, the other is relatively stable in hand, and the third is very good imaging. If the economy allows, mirrors of different sizes such as exit pupils can be configured, which have different uses and portability.

It's not as big as possible, to be suitable, the general 8 times is suitable at 40-50, the multiple of the handheld is controlled at 6-10 times, the multiple is too large, the caliber is required to be large, the diameter of the mirror is large, and the shaking is also larger, so it is necessary to accompany the bracket. . . . So, well. You will choose according to the standard of 8 times, and the field of view of the caliber that is too small is too small, and it is unreasonable!

6-10 times.

The ideal telescope should magnify the target losslessly, and restore the details realistically, many users feel that the magnification of the telescope should be as large as possible, in fact, the magnification of the telescope is determined by many factors, and each telescope is marked with the main parameters, such as 7x35 means that the mirror is 7x, and the objective lens diameter is 35mm. Generally, less than 6 times is a low magnification, 6-10 times is a medium magnification, and more than 10 times is a high magnification. Now the main discussion is about the magnification of binoculars.

However, it has been proven that the most suitable telescope for handheld observation should be 6-10x magnification.

Precautions for the use of telescopes.

Never use a telescope to look directly at the sun, as strong sunlight can cause great damage to the eyes.

Users who wear glasses are advised to turn down the goggles before making observations when using the telescope, so that they can see the full field of view.

Although many telescopes are now waterproof, try not to throw the telescope into the water in order to try such a function, the telescope is a precision instrument, and you should never slam the telescope, put pressure on it, or do other strenuous movements.

The above content refers to Encyclopedia - Telescope.

People's Daily Online-How big are the eyes of the telescope? This parameter is critical.

The aperture of the telescope is used to indicate the size and clarity of the field of view. The larger the aperture, the larger the field of view, and the clearer the image.

The larger the caliber, the higher the **, and at the same time, it may cause the equipment to be bulky and inconvenient to operate.

The magnification of a telescope refers to the magnification of its field of view. Therefore, the optimal magnification of the hand-held telescope depends on the type of observation activity and the individual's observation habits and hand stability.

For planetary observation or observation of other bright objects, multiples of hand-held telescopes can reach 10x to 20x. These multiples usually do not require the use of a tripod or other supports, as the weight of the hand-held telescope does not affect the stability of the attitude, and the multipliers are high enough to observe some subtle features.

If you want to observe more distant objects, such as nebulae or star clusters, a higher multiple may be more appropriate. Typically, this involves scaling up the mill with a ratio of 30 to 50 times, or even higher. However, higher magnifications mean a smaller field of view, greater detail, hand stability, and the need for higher quality telescopes.

In general, the choice of multiplier for a handheld telescope needs to be based on the purpose of observation, personal needs, and use scenarios. Depending on your own experience and needs, usually a 10x to 20x handheld telescope will suffice most people's needs, but if you need higher magnification, detailed screening requires more research and thought. The ultimate goal is to get the best possible view and enhance the observation experience, so there are various trade-offs that need to be weighed.

Is the aperture of the largest telescope in the world at the moment more meniscus less?

Rice. Rice. Rice. Rice.

The answer is true: Quietly c

Telescopes can be divided into handheld telescopes and tabletop telescopes. If it is handheld, 7-10x magnification is best, and if it is tabletop, 10-40x magnification is best. Hand-held telescopes can be carried around, whether civilian or military, and the magnification of hand-held telescopes has an optimal magnification range, which is 7-10 times.

Desktop telescopes can see objects magnified by 10-40 times because they are supported by a tripod, and the effect is best at this time.

The magnification of ordinary hand-held telescopes should not exceed 10 times, and the magnification of desktop telescopes should not exceed 40 times, except for astronomical telescopes.

When holding a telescope in your hand, you should take into account the comfort, the size of the volume, and the size of the multiple.

The volume is related to the objective lens of the telescope, about 50 caliber is suitable for hand-held, generally not more than 70 caliber, the size of the base is large, the weight is heavy, and it is easy to shake in the hand, causing eye discomfort.

The multiple of the hand-held telescope is generally about 10 times ** more comfortable, the telescope is used for trouser tourism and sightseeing with about 10 times on the line, looking for the hornet telescope, looking for the bee telescope, looking for the honeycomb telescope, with about 15 times on the line. <>

It's a thoughtful question, and it's good! However, the question is very simple.

1. Mankind has built the Hubble Telescope, which is a meter diameter and a ton weight, and has also built the world's largest optical telescope with a diameter of 10 meters. But compared to radio telescopes.

The radio telescopes currently in operation in the world have reached 350 meters. Therefore, the difficulty of construction is the primary concern.

Second, optical telescopes are greatly affected by the atmospheric environment, which is one of the reasons why the Hubble telescope should be sent to space to work. However, this does not mean that the construction of large-aperture optical telescopes on the ground has been abandoned. It is reported that a huge optical telescope with a diameter of 30 meters will be in Hawaii, USA, in the next ten years.

When built, it will have ten times the resolution of the Hubble telescope.

3. Although radio telescopes are not as intuitive as optical telescopes and require electronic conversion verification, they can make the diameter very large. The 350-meter-diameter radio telescope will soon be relegated to second, and it is reported that the world's largest 500-meter-diameter radio telescope is being built in a "Dawotai" in Guizhou, China, and will be put into operation in 2014.

4. Although light and electricity are both 'waves', their frequencies are different, and observing the universe at different frequencies will reveal more extraterrestrial information. That's why it's important to develop radio telescopes and rebuild optical telescopes...

Follow-up : I also heard about the fast500m radio telescope, a very large guy. The point I am asking, though, is why the radio bands need a larger aperture to achieve the same resolution as optical telescopes. Hope for an answer.

Follow-up : Astronomical telescopes.

Optical and radio) resolution is one of the most important indicators. For both optical and radio telescopes (excluding radio interferometers), the larger the diameter of the antenna, the higher the resolution. But radio telescopes have another metric that is just as important as resolution: sensitivity.

The inherent noise floor of the received signal in the process of amplification, detection, terminal restoration, etc., will affect the noise from outside the sky"Least measurable"Energy value, this influence will sometimes be very large, coupled with the need to resist the influence of environmental interference waves, etc., according to the current level of receiving technology, the required received signal must reach more than 10 watts to be able to detect and process a truly useful recognizable signal, which is destined to have a larger diameter of the radio telescope to solve the problem of sensitivity.

Follow-up question: The sun is only 1300 watts per square meter, is 10 watts a bit too big?

Follow-up : This is the focal collection power of a large-aperture radio telescope, and the general guaranteed value needs to be 20 watts, but between 10-20 is OK.

The so-called radio telescope is actually an astronomical instrument used to observe the radio energy sent from different directions in the sky, which is a highly directional antenna and corresponding electronic equipment. Therefore, it has been said that radio telescopes are more radar receiving antennas than telescopes.

So, the antenna is the heart of the radio telescope, which is used to receive electromagnetic waves in the radio band, and then induce a voltage on its metal antenna, so that an analog receiver can be used to measure the specific value of this voltage. Obviously, the larger the antenna, the more electromagnetic waves can be acquired, and thus the weaker the electromagnetic signal can be observed. The huge disc-shaped metal part that we often see is the antenna of a radio telescope.

The 500-meter aperture spherical radio telescope (FAST) is the largest and most powerful single-antenna radio telescope currently under construction in the world. It has a diameter of 500 meters, a receiving area of nearly 30 football fields, and a main reflective surface of 250,000 square meters.

FAST is located in "Dawotai" in Qiannan, Guizhou Province, first, the landform is closest to FAST, and the excavation amount of the project is the smallest; Second, the karst geology here can ensure that rainwater penetrates into the ground and will not accumulate on the surface and damage and corrode the telescope; Third, the radio telescope needs a "quiet land", and there is not a single township within a 5-kilometer radius of the "Dawotai", and the radio environment is ideal.

How far can the giant eye see the sky?

The edge of the known universe can be seen.

Why build the Sky Giant Eye, the world's largest single-aperture telescope, AST was originally proposed as the SKA (Square Kilometer Array) China program, at that time it was considering the construction of about 30 large antennas such as FAST in Guizhou to form a square kilometer array. But it is a pity that later the Chinese plan was not accepted.

Later, the state decided to build a large telescope according to the existing design. Such a large-aperture radio telescope is still very useful. The larger the diameter, the higher the sensitivity, and the ability to detect faint celestial bodies.

For FAST, faint pulsars, galactic companion galaxies, information about the reionization period, dark matter and dark energy, etc., are all its research contents. It may also discover other celestial objects or phenomena that have not been observed before.

In short, with such a device with greater sensitivity than ever before, we have a powerful capital to impact the frontiers of astronomical research.