What is the larger than the telescope multiplier, the greater the maximum multiples of the telescope
What to think of the Telescope multiples
The multiples of the Telescope are the previous number, and the latter number is a plympite diameter.These two numbers have no specific effect, which is two separate parameters.
For example:20X22 Represents the multiplier 20 Be more, the aperture diameter is 22mm Essence
The larger the Telescope multiples, the better, the better
The multiple of the Telescope is theoretically inversely proportional to the visual field of the Telescope. The higher the multiple, the smaller the view.Therefore, the multiples of the Telescope are not too large.50mm The diameter binocular Telescope, if it is here 20 The double is basically the limit. If the multiple is large, the field of vision is too small.It is basically impossible.
Common multiplayer of the Telescope
Common7 Double 8 Double 10 Times. 12 The higher or even higher Telescope does not have technical difficulty, but if you do not need a tripod, you will be able to see anything.
Maximum multiples of the Telescope
1 There is a standard multiple range of holding Telescope, that is, 7 ~ 10 Between times, the range of this multiple is obtained through long -term practice.
Because the higher the multiple, the better, while increasing the multiples, it will also cause problems such as narrow vision and jitter.
2 , "The highest", in fact, the highest ones are 20 Double, 16 Double, 12 More, but there are no such products. What are such products?They are all deformed and low -end, rely on multiple to seduce products of consumers who are not familiar with Telescope.
Shipped Telescope purchase suggestion
Watching the scenery, double Tube6 ~ 8 The best, the eyepiece 32 ~ 42 Between the backblasses.
In the case of stargazing, double Tube8 ~ 12 The best, the eyepiece mirror 42 ~ 50 Between the backblasses.
Paul mirror is not recommended, because the same caliber, the gyrolasses are much lighter than Paul mirror, which is more suitable for handheld and shake.
Not recommend50 The above is also considering the weight, 50 Even if the above ridge is needed 1kg If you hold it, it will inevitably shake.
What to think of the Telescope parameter
The magnification of the Telescope: that is, the magnification (multiple) of the Telescope is a magnifying multiple through the Telescope observation target.It is equivalent to observing objects at 100 meters with the naked eye. Its value is equal to the ratio of the focal length of the object mirror to the focal length of the eyed mirror.
The caliber of the Telescope:Here refers to the diameter of the objective mirror. It is usually expressed by mm. For example, 7X50, then it means that the diameter of this Telescope is 50mm.
The focus method of Telescope:In general, there are two types, one is the intermediate focus, that is, by rotating the focus wheels in the middle of the mirror body, the appearance of the two eyepiece is gradually clear.There will be a separate coke wheel on the right eye mirror of some Telescopes. This is because the eyes of the two eyes may not be the same vision, so you can adjust the right eye alone.The coke wheel, open the right eye after the left eye is clear, and then open the right eye. After the right eye mirror is adjusted to adjust the right eye mirror alone, the eyes are clearly debugged, and the intermediate focus wheel can be adjusted uniformly.
The other is to focus separately, that is, close the right eye to debug the eye mirror of the left eye alone. After the debugging is clear, close the left eye to adjust the right eye mirror alone. After debugging the clear debugging, you can enjoy the beautiful scenery.
Prism system:Now the mainstream Telescope prism system uses two basic designs: ROOF prism or Porro (also translated Porro, Poparo, Baoluo) prism.
The roof spine prism system is that the optical structure is relatively light and compact, and it is more suitable for outdoor sports portable products; the disadvantage is that the light losses are more and the imaging is relatively darker (but with the development of coating technology, the imaging effect of the Telescope of the roof structure is greatly great.Improvement), high requirements for assembly accuracy, difficulty in manufacturing, and expensive prices.At the same time, the appearance is much more complicated than the Paul prism, and it is difficult to process. In addition, it is difficult to be more difficult to assemble and maintainability, so the cost is high.
Paul prism is also called right -angled prisms. It is a traditional classic design. The more common design is composed of two exactly the same right -angle prism. The advantages are simple shapes, light transmission and brightness will have good effects, easy to process and assemble, disadvantages, disadvantagesIt is relative to the roof prism, with a large weight and volume.
Prism material:In terms of prism materials, in the current sales market, the internationally commonly adopts the brand sign of the German Shawt Company. The two common materials used in Telescope prisms are BK-7 (Shawot Company, and my country's factory approximate material brand number For K9) or BAK-4 (Schart Corporation, the similar material brand of my country's factory is K7).
BK-7 or BK-4 are both economic and efficient design that have been tested in history. In comparison, BAK-4 glass has a high refractive index, eliminating the internal light scattering loss.Essence
Nearly focal distance:That is, the distance between the observed object can be seen. For example, the near focal distance is 3 meters. Then the object is blurred within 3 meters, and the focus can be seen clearly by focusing 3 meters away.
Pupil diameter:After the light is converged by the eyepiece, the diameter formed by the spots formed after the eyepiece.For the optical equipment used by the naked eye, the light must be used to enter the retina imaging after the pupils. Human pupils are about 3mm during the day and the maximum of about 7mm at night.When observing it with optical equipment, the bright spots formed by the lighting of the eyepiece will be projected on the pupil. Therefore, the larger the diameter of the pupil, the greater the brightness of the imaging.
The calculation formula of the diameter of the pupil is: p = d / m where P represents the diameter of the pupil, D represents the diameter of the object, and M represents the magnifying multiple.
Pupil distance:It refers to the distance between the last lens of the eyes and the eyepiece when it can be seen clearly.Many binocular Telescopes are designed to grow out of the pupil Telescope, mainly because it is comfortable to use, and the viewing of the scenery is brighter, especially users wearing glasses, can not take off their glasses, and some ordinary pupil Telescopes.It is difficult to use.
Telescope Vision:Highlight the sky range that can be seen in the remote mirror or twin Tube Telescope.The field represents the maximum range that can be observed through the Telescope. Usually, it is expressed from an angle. The larger the viewing field, the larger the observation.The field of view is generally represented by the vision (observable width) and an angle of view. There are three common methods: one is to directly use angle, such as Angle of view: 9 ; the other is a thousand thousands;The visual range of the rice, such as Field of View: 158m/1000m; the third is the thousands of feet used by some countries abroad, which is actually similar to the second, such as Field of VIES: 288FT/1000Y.
Relatively brightness:The relative brightness is calculated based on the formulas such as multiple, caliber, etc. The current simple calculation method is the Square of the diameter of the pupil.
Far mirror resolution:The actual resolution of the Telescope generally does not exceed 20 ", mostly within 10", and the resolution of the naked eye is 60 ". Therefore, the naked eye that can be seen through the Telescope cannot see clear objects.
Telescope coating:Optical coating: This is the lowest -level coating. The price is cheaper. Generally, it is a mirror -surface shelter film, generally plating mirror.
Full coating: All lenses are plated with single -layer membranes.This will increase the pass rate of light from 50 % to 80 %.
Multi -layer coating: At least one film is plated more than one layer of membrane.
Full mirror multi -layer coating: This is the most advanced coating.It indicates that all mirrors are made of multi -layer coating, which can increase the pass rate of light to 90-95 %.