How many times is the maximum of the bird watching telescope, and how many times is the best of the

If it is a binocular one, it is generally about 10 times, and the kind of bird watching scope with a bracket for a monocular can basically reach about 60 times.

Scope of application and characteristics of monobinoculars:

1.Binoculars are easy to carry and are the first to observe forest birds.

2.The monocular general objective lens has a large aperture and is mostly a zoom, which is suitable for observing long-distance waterbirds. For example, if you want to distinguish the black color of the tip of the beak of a middle egret, it is difficult to see it without using a monocular.

Binoculars Selection:

1.8-10x magnification is best. If it is small, it is not clear enough, and when it is large, it is easy to get dizzy and shaky.

2.It is advisable to choose 30-50 caliber. Take 42 as a classic.

3.New birders don't choose too good binoculars. It's better to choose less than 200 yuan, because you don't know how long your hobbies and passions can last. Wait until you have practiced the basic skills and then replace them.

Telescope selection:

1.The commonly used multiplier of a monotube is 20 to 40 times. No matter how large the multiple, the amount of light entering is very small, and the image is blurry.

2.The caliber should be above 60. Last time I used the school's Zeiss.

You can clearly see the golden eye sockets of the golden plover, which also makes Ziye really proud of Zeiss.

3.Novices can use a monotube within 2000. ED lenses can be replaced slowly.

Binoculars can reach 20x magnification and astronomical telescopes can reach 200x.

No matter how high the magnification is, the image quality will be poor, and there is basically no practical value. A telescope is an optical instrument that uses optical devices such as lenses or mirrors to observe distant objects.

The light passing through the lens is refracted or reflected by the concave mirror into the small hole for convergence imaging and then seen through a magnifying eyepiece. Also known as:"Claircase"。The first function of a telescope is to magnify the opening angle of distant objects, allowing the human eye to see details with small angular distances.

The second role of the telescope is to send a beam of light collected by an objective lens much thicker than the diameter of the pupil (up to 8 mm) to the human eye, allowing the observer to see dim objects that were previously invisible.

The magnification of a telescope is the focal length of the objective multiplied by the focal length of the eyepiece. Unlike microscopes, in principle, infinite magnification is possible, but magnification only makes sense if it is effective magnification.

The maximum effective factor is the number of millimeters of the objective aperture stool multiplied by 2.

Thus, astronomical telescopes will be massive, but in fact, objective lenses can not become infinite. Too heavy will increase the stability of the bracket, and double the brightness will decay into a square. So, in practice, the maximum usable magnification of a typical telescope will not exceed 300x. <>

In the past, military telescopes were mostly 6 or 8 times larger, but now 7 times the military telescopes are quite collapsed (the reason is that the visual distance of people is about 7 km).

The magnification of telescopes is generally divided into three grades: medium magnification (6-10 times), large magnification (10-20 times) and variable magnification (20-40 times in German style, 25-40 times in domestic mode).

In addition to the United States and Germany, Russia and China have successively developed seven-fold military telescopes and equipped their troops. If the telescope is more than 10x, it should usually be mounted on a tripod for use, if it is only used with arm support, the tremor of the hand will have a serious effect on the observation, and the observation effect will be worse. In addition, when evaluating the selection of telescopes, the magnitude of the geometric optical force should also be considered.

Chang shirt volt. In terms of optical performance and structural performance, the military telescope is relatively excellent and reliable, because its design is more prudent, with excellent materials and exquisite craftsmanship, such as good image quality, less stray light, and the magnification matches the size of the entrance pupil to achieve the best resolution.

Due to the high quality requirements, military telescopes must undergo environmental tests before leaving the factory, generally including vibration test, high temperature (1055) test, low temperature (145) test, rain or water immersion test, and air tightness test. After these tests, the performance of the product can still be guaranteed to be within the specified range before it can leave the factory.

Some products also have a dryer in the lens body, which extracts air before leaving the factory and then fills in dry air or nitrogen, which effectively prevents mold and fog in the internal lens in the future. Ordinary civilian telescopes generally do not do environmental tests, or only do partial tests. This is something that people can't know from the market, and you can't see it from the appearance of the product alone.