The clarity of astronomical telescopes is related to something

Sharpness and objective aperture.

Resolution. There is a great deal to do with it.

The clarity of astronomical telescope imaging includes the following three aspects: 1. Image quality or image quality for short; 2. Imaging brightness; 3. Imaging contrast or contrast.

The imaging quality of an astronomical telescope determines how small a target can be or how small a detail can be on a target at a given distance. Under the premise of a certain aperture, the imaging quality mainly depends on the optical quality of the lens. Generally speaking, the resolution of a good quality mirror is very close to the theoretical resolution, that is, it can distinguish between details on a target with an angle of view equal to the aperture of the operating wavelength, or two targets with an angular distance of this value.

Under amateur conditions, the image quality can be judged by observing the star at the highest magnification - at a magnification exceeding the aperture of the objective lens by millimeters*2, the diffraction ring around the star point can be seen, indicating that the mirror image quality is good.

The brightness of the image mainly depends on the aperture and working magnification of the objective lens, as well as the transparency, coating structure and quality of the lens. In the field of astrophotography, imaging brightness also involves another metric – the focal ratio of the objective lens, or the f-number, which is equivalent to the aperture of the camera lens. The higher the f-number, the brighter the image in direct focus photography, and the shorter the time.

The concept of contrast for telescope imaging is basically the same as that of a television image, and it expresses another performance of a telescope - stray light suppression, or extinction performance. If the structure of the mirror (mainly the matting coating and matting thread, extinction ring and lens hood) in the lens can not effectively suppress these diffused light, the imaging will present a dim and turbid effect, the field of view is white when used during the day, and the background light submerges the details of the target celestial body and even the target itself when observing at night.

In addition, there is another factor that affects the "clarity" of an astronomical telescope, which is in quotation marks to show that it is a final observation concept. It is the stability of the bracket - the bracket of the astronomical telescope must be strong enough to ensure that the main optical path is accurately and stably pointed to the target, if the bracket is unstable, the seismic and wind resistance of the whole mirror is poor, and the vibration and even shaking of the imaging will be clearly felt at high magnification, and the subjective "clarity" is impossible to talk about. In addition, when it takes a long time, stent performance becomes one of the most important performance indicators in the system.

What is the difference in astronomical telescope eyepiece size. The more detailed, the better.

Hello dear, the 10mm eyepiece is the most commonly used, except for some particularly large and faint deep-sky objects (such as M31); The 2,20mm eyepiece can obtain a relatively low system magnification, which is used to see open star clusters, globular clusters and nebulae, galaxies, etc., and can also be used to find stars, that is, to find the target celestial body and then change to a short-throw eyepiece for high-magnification observation. The magnification that can be obtained by the 3,4mm eyepiece is very high, and it is mainly used to distinguish binary stars, observe the details of the surface of planets and moons, and check the accuracy of the objective lens. Astronomical telescopes, modulus stool mirrors, eyepieces, don't seem to have a short focus like millimeters.

Please verify that the xxmm you mentioned earlier is the eyepiece focal length unit millimeter, if it is useful, please give a thumbs up! Here, I also wish you good health, all the best, and all your wishes come true! Pay attention to safety measures during the epidemic

Astronomical telescopes and ordinary telescopes have the following main differences:

Different uses: Astronomical telescopes are used to observe stars and celestial bodies in the sky, while ordinary telescopes are mainly used to observe objects and people on the ground.

Different structures: Astronomical telescopes are usually designed in a refractive or reflective style with high optical accuracy and stability, and at the same time need to be equipped with various accessories and devices to observe different celestial and star objects. Ordinary telescopes, on the other hand, usually have a refractive or reflective design, and the structure is relatively simple and does not require too many accessories and devices.

Different: Astronomical telescopes are usually higher because they require higher optical precision and more complex structures. Ordinary telescopes are comparatively lower because of their relatively simple structure and requirements.

Different levels of difficulty in use:

The use of astronomical telescopes requires a certain amount of astronomical knowledge and skills, as the stars and celestial bodies to be observed need to be calculated and located. Ordinary telescopes, on the other hand, are relatively easy to use and do not require much astronomical knowledge and skills.

Here's a tutorial on using an astronomical telescope:

Choose the right time and place:

Choose a place where there is no light pollution and choose a night with good weather to use a telescope.

Installing the telescope:

Install the telescope according to the instructions in the manual.

Adjust the focal length of the telescope:

Point the telescope at the object or star you want to observe, and adjust the focal length of the telescope so that the image is clearly visible.

Observation of celestial bodies: By observing celestial bodies or stars through a telescope, it is possible to observe the details and characteristics of celestial bodies such as stars, nebulae, star clusters, etc. <>

Astronomical telescopes are also telescopes, and the basic structure of telescopes is similar. (There are two types of telescopes: Galilean and Kepler.) The Galilean type consists of a concave lens and a convex lens, while the Kepler type consists of two or two sets of convex lenses; Galileo-type orthogonal image, Keplerian-type inverted image) It's just that astronomical telescopes have larger aperture and better optical performance than oak medium-sized telescopes.

The magnification (the focal length of the object branch divided by the focal length of the eyepiece) mentioned by the landlord does not seem to be a parameter of the astronomical telescope, because the eyepiece can be replaced. When the objective lens is fixed, the ultra-short eyepiece with the focal length beam can achieve ultra-high magnification, but the imaging quality at this time is really not complimentary, because the higher the magnification, the blurrier and darker the image will be. I think the aperture is the key to the quality of an astronomical telescope.

The larger the aperture, the larger the spotlight, and the clearer the image (the higher the resolution), the fainter the object we can see.

For the same object, the longer the focal length, the larger the image size of the object in the focal plane. The larger the size of the resulting image, the larger the scale.

The reasons are as follows: 1) Introduce two concepts of Lachun:

Aperture - refers to the effective diameter of the objective lens, which is often expressed as d;

Relative aperture - refers to the ratio of the effective aperture of the objective lens to its focal length, also known as focal ratio, which is often denoted by a; i.e. a d fThis is a sign of the light power of the telescope, so it is sometimes called a light power.

2) The relative aperture of refracting telescopes (generally small and medium-sized astronomical telescopes) is relatively small, usually 1 15 1 20, while the relative aperture of reflecting telescopes (depth space) is relatively large, usually when observing a celestial body with a certain visual surface, the line size of its visual surface is proportional to f, and its area is proportional to f2. The luminosity of an elephant is directly proportional to the amount of light collected, i.e., to d2 (the square of d) and inversely proportional to the area of the image, i.e., inversely proportional to f2 (the square of f).

The focal length f of the objective lens is the main indicator of the scale of the film in astrophotography, so according to a = d f, the area is proportional to the square of f2, and when f becomes larger, the area naturally becomes larger.

If we want to observe very long celestial bodies, we must use large astronomical telescopes as much as possible, in other words, the bigger the telescope, the better. The size of a telescope usually refers to its clear aperture, that is, the aperture size of the micrometer eyepiece.

It is a reflection of the telescope's ability to observe celestial objects, and the larger the aperture, the more celestial objects can be collected, and the stronger the ability of the radiant condenser. Therefore, in order to observe longer and darker objects, it is necessary to use telescopes with large apertures. Everyone considers the telescope's ability to distinguish according to the angle of the telescope.

The telescope can just separate two celestial bodies or a part of a celestial body, in the case of excellent equipment, the larger the aperture, the higher the screen resolution of the telescope, the larger the celestial body that can be observed, so most astronomical telescopes tend to be built, so the construction of larger and larger telescopes.

From the time Galileo invented the first astronomical telescope to the present, the progress of astronomical telescopes has been particularly rapid.

For more than 300 years, the aperture of electron-optical telescopes has long since developed from 3 centimeters at that time to 10 meters away today. Most telescopes also include infrared telescopes, radio telescopes, X-ray and Y-ray telescopes, and ultraviolet telescopes, and these telescopes are getting bigger and bigger. The telescope is like the fiery eyes of a scientific purist, enabling her to obtain a lot of precious observation materials, so that everyone can gradually explore the mysteries of the universe.