What are the important parameters for buying a telescope What do they mean

1. When people buy telescopes, it is common to have several Arabic numerals on the price list, so what technical parameters do these numbers illustrate? Let's give an example of an interview. For example, it is marked with 10 50 mm 5°, which means that it has a diameter of 50 mm and a field of view of 5 degrees (i.e. at 1000).

Some people may think that the higher the number of technical parameters, the better, but this is not the case. The magnification is inversely proportional to the width of the field of view, that is, the larger the magnification, the smaller the width of the field of view, which is not conducive to the search of the shack. The larger the diameter of the objective lens, the more light intake, and the stronger the resolution ability when the light is insufficient, but this will inevitably lead to an increase in the volume of the telescope, which is not conducive to carrying.

2. After saying this, you may feel at a loss, but as long as you can learn from each other's strengths, you can also buy a telescope that you like.

Nature observations, concerts, competitions, military industry. Magnification: 12x Prism System:

Roof Ridge Prism Material: BAK-4 Exit Pupil Diameter: 5mm Exit Pupil Distance:

Minimum Observation Distance: Waterproof: Waterproof.

Golden Eagle monocular parameters 12x50

Magnification: 12x Prism System: Roof Ridge Prism Material Cavity Acacia:

BAK-4 exit pupil diameter: 5mm exit pupil distance: the closest observation distance is suspicious

Waterproof function: It has a waterproof function.

Details: Basic Parameters of Burning Orange Parameters Product Uses Natural Observation, Pi Chun Concerts, Competitions, Military Industry, Outdoor Activities Magnification 12x Prism System Roof Ridge Wu Hong Prism Material BAK-4 Optical Zoom Pupil Diameter 5mm Pupil Distance Minimum Observation Distance.

Others: Anti-envy and anti-fog function with waterproof function and anti-fog function with nitrogen-filled anti-fog brother high effect lens coating FMC multi-layer coating product size 170x60x75mm error correction product weight 410g

Summary. The important parameters of the telescope are: aperture, ultimate magnitude, resolution, ultimate magnification, chromatic aberration, magnification, and extender.

The important parameters of the telescope are: aperture, ultimate magnitude, resolution, ultimate magnification, chromatic aberration, magnification, and extender.

1) The larger the aperture of the telescope, the greater the light collection power (the light collection force affects the brightness of the telescope's field of view, etc.). The aperture of a telescope refers to the diameter of the objective lens, that is, the diameter of the lens of the telescope.

For example, in the case of the Innovent 102 1000 refracting telescope, the first set of numbers 102 indicates the aperture (mm) of the telescope, and the second set of numbers is 1000mm (mm). (2) Extreme magnitude (extreme magnitude affects telescopes to see the faintest celestial magnitude).

The larger the aperture of the telescope, the greater the limit magnitude that can be seen. Limit magnification(3) Limit magnification (limit magnification affects the maximum effective magnification that the telescope can get). Generally speaking, we consider the limit magnification to be 2 times the aperture of the telescope, for example:

The limit magnification of the 102 1000 slag orange telescope is 200 times, but this is only theoretically speaking, there are differences in the optical quality of the dust beam of the same model and different brands of telescopes, and a telescope with excellent optics can exceed the limit magnification by about 50 times! It is important to note that the magnification of the telescope is not always better!

Once the magnification exceeds the limit magnification of the telescope (effective magnification), the image quality will be blurred and details will be lost due to invalid magnification. (4) Resolution (resolution affects how much the telescope can distinguish the dark details of the celestial body). The larger the aperture of the telescope, the stronger the resolution!

5) Chromatic aberration The longer the focal length of an ordinary achromatic refractive telescope, the stronger the ability to control chromatic aberration. However, the larger the aperture, the longer the focal length, the larger the volume length of the telescope, and the less portability. (6) Magnification The magnification calculation method of the telescope:

Objective focal length Eyepiece focal length, e.g. 102 1000 telescope, primary lens focal length is 1000mm (mm), when using a 10mm (mm) focal length eyepiece, its magnification is 1000 10 = 100x (7) Extender (Barlow or Barrow): The objective focal length can be extended by two times (2x) or three times (3x) or more, and the combined magnification of the telescope after the extender is the focal length of the objective eyepiece focal length x extender.

1. First of all, from the specification, the specification of the telescope is determined by the multiple and the aperture of the objective lens, which is compared to the 10x50 spectator of the telescope, 10 represents the multiple, 50 represents the diameter of the aperture of the objective lens, first say the multiple, the multiple is very important, what is the multiple of the telescope, it is related to how many times the distant object is brought closer.

2. From the optical point of view, the optical quality of the telescope, the coating of the lens is very important, the role of the coating is to reduce the reflected light irradiated to the telescope lens, the worse coating is only on the telescope part of the lens (generally the outer surface of the objective lens and eyepiece), the good mirror will be coated on the surface of all lenses, the better mirror will be coated on the surface of some lenses, and the best mirror will be coated with multi-layer film on the surface of all lenses. This is one of the important reasons why telescopes of the same specification are far from each other, and the easiest way to judge the coating of a mirror is to observe the reflection of the lens, the darker the reflection, the more transparent the lens, and the better the coating.

The performance of a telescope is determined by some of its key parameters.

The slave is an optical material for optics; BK4 and BAK7 (ED lenses are made of fluorite material is the best and most expensive), BK4 is better than BAK7, but it is also divided into several grades in BK4, the better flawless light transmittance is generally used in military optical systems, followed by general use in civilian optical products.

Diameter and coating of the objective lens; The diameter of the objective lens is large, the amount of light is larger, and the 50 caliber and 42 caliber seem to be almost the same, but the difference in the amount of light is 30%, which is not small, and the resolution of a telescope with a large aperture is high. The better coating is the green film, and the ordinary film is the blue film.

The magnification of the telescope: 6 to 8 times the hand-held binoculars are good, more than 10 times is difficult to hold the stability of the hand and cause the dazzling is very uncomfortable.

Then there is the exit pupil distance and exit pupil diameter; At night, our eyes have dilated pupils, usually during the day. The larger the diameter of the exit pupil, the more comfortable and bright the eye looks, and the large exit pupil distance is suitable for people who wear eyes.

The conclusion is: the one below will be much better than the one above!!

Beijing Galaxy Telescope will answer for you

A very important parameter of the telescope is the aperture, in principle, the larger the aperture, the better, the lower is 50, the upper is 42, the lower is better, in addition to the prism system is also very critical, BAK7 is the old system, BAK4 is the new system, from the imaging clarity and chromatic aberration convenience are better, so the following prism system is good.

The second is good, because the optical glass of BAK4 is better than BAK7, the first friend said that the caliber is the most important, I think this is a wrong statement, the caliber and magnification should be determined according to the actual use, not necessarily big.

The following one is better, the telescope performance parameters mainly look at: aperture, focal ratio, magnification, field of view, resolution.

Among them, the caliber is the most important, followed by the resolution.