Master teaches you how to choose a telescope!

First of all, choose the telescope from the following aspects.

(a) species (prism versus roof prism)

Binoculars can be divided into two categories: poof prism and roof prism. The profile type has simple structure and higher light transmittance than the roof type at the same level. Because of the wide distance of the objective lens, the image is more stereoscopic. Also, because the process requirements are lower, the price is generally cheaper. Roof type has complex relative structure, high precision, difficult development and high cost and price. The two groups of prisms are in line, which makes it smaller in size, better in hand feel and better in sealing performance, and its recent focusing is shorter than that of the ordinary type.

(2) Multiplication (it should be between 8 times and 10 times)

The telescope is marked with the words 10X42'8X30, where the former represents the magnification and the latter represents the objective diameter. Look at a bird standing at 100 meters with a telescope that is 0/0 times that of100 meters, just like looking at it with the naked eye. Because the magnification is too large and the viewing angle is too small, it is difficult to search for the target, and it is easy to affect the clarity because of the trembling of the hand. When the light is very sufficient, 10 times is clearer than 8 times; In the case of insufficient light, you can see more details at 8 times than 10 times, and you can't blindly pursue high magnification.

The telescope is marked with the words 10X42'8X30, where the former represents the magnification and the latter represents the objective diameter. Look at a bird standing at 100 meters with a telescope that is 0/0 times that of100 meters, just like looking at it with the naked eye. Because the magnification is too large and the viewing angle is too small, it is difficult to search for the target, and it is easy to affect the clarity because of the trembling of the hand. When the light is very sufficient, 10 times is clearer than 8 times; When the light is insufficient, 8 times can see the details better than 10 times, and you can't blindly pursue high magnification. ?

(3) Diameter (preferably between 30mm and 42mm)

The bigger the aperture, the better. The diameter of the objective lens affects the amount of light entering. Especially in the case of strong contrast between light and dark, dusk and cloudy, the larger the aperture, the higher the amount of light, and the more details the eyes can see; But at the same time, the heavier the telescope, the easier it is to cause fatigue when watching it for a long time. You should choose a larger caliber according to your physique.

(4) Vision (the bigger the better)

The visual field refers to the range that can be seen from 1000m, and the width of the visual field is higher than 104m, that is, 6 degrees. The bigger the field of vision, the faster and easier it is to search for the target. However, the larger the field of vision, the more serious the distortion and blur of the edge, the more complicated and difficult the aberration correction is, and the higher the technology and cost are.

(5) Color fidelity (the more natural the better)

A high-quality telescope must faithfully reflect the primary colors and color saturation of the scene. In order to increase the height of the telescope, some manufacturers deliberately increase or decrease a certain light wave, which leads to distortion and makes the scenery appear blue or red. ?

Second, behind the clear, sharp and colorful fax images.

Patents SWAROTOP and SWARODURE?

(Multilayer coating increases light transmittance)

Swarovski added patented multi-layer coating on the surfaces of lenses and prisms, which greatly reduced the light reflection from 4%-6% to 0.2%. Since it takes more than ten reflections for the light to reach the eyes from the object through the telescope, the multilayer coating of SWAROTOP and SWARODURE greatly improves the light transmittance from 60% to 93%, making the image brighter, clearer and more delicate.

Innovative SWAROBRIGHT interferometer (increasing color saturation)

In fact, for many years, various manufacturers failed to solve the problem of light loss due to reflection in the prism group. After years of research, Swarovski finally made a breakthrough. In vacuum at -263℃, 30 thin films with a thickness of one millionth of a millimeter were plated, thus forming a SWAROBRIGHT interferometer on the prism surface. Compared with the traditional metal mirror, SWAROBRIGHT has the advantage of greatly improving the reflectivity of each band of the spectrum to 99.5%.

Therefore, the image is clearer, the color is more saturated, natural and the fidelity is higher than before. In addition, SWAROBRIGHT interferometer will not degrade its performance over time like traditional metal mirrors. ?

(On the left is a general telescope, and on the right is SWAROBRIGHT painted by Swarovski, so the image will be more vivid. )

P coating (reducing dispersion and ghosting)

For the telescope with roof prism, due to the reflection interference, dispersion and ghost caused by light, a phase correction film, called P film, must be added to improve the image quality.

Swarovski combines scientific theory, precision instruments and advanced technology to bring you almost perfect images.

Third, considerations other than optics.

(a) the degree of firmness

Telescopes are mostly used outdoors. The protection of plastic shell is not very good, and the prism group is easy to shift due to excessive temperature change. You know, as long as the parallelism of the visual axis of the eyes is slightly deviated, it will make the eyes tired and uncomfortable for a long time, and even have a headache and vomiting. Swarovski telescope is made of metal shell, which is durable and covered with rubber. It can not only prevent slipping and collision, but also absorb the inaudible high-frequency noise when the parts are running, so as to prevent birds or animals from noticing it.

(2) All weather

The lens barrel of Swarovski telescope is completely filled with nitrogen, which is waterproof to 4 meters and can be used in rainy days. In addition, the nitrogen-filled lens barrel can effectively reduce the chance of being damp and moldy, and greatly extend the service life of the telescope (the original factory provides a ten-year warranty, and individual products provide a thirty-year warranty).

Filling nitrogen into the sealed lens barrel can prevent mildew and fog.

(3) Weight and handle

Telescopes should not be too heavy, otherwise long-term use will make people tired, make their hands tremble and can't see the target clearly. At the same time, the telescope should not be too light, otherwise it will be easy to operate and unstable to watch because of shaking. Swarovski with ergonomics, all products have a good sense of balance and first-class feel, so that their optical properties can be fully played.

Swarovski EL series, patented hollow design, can be operated with one hand.

(4) Intimate design

In addition, Swarovski comes with a decompression shoulder strap, which can disperse the weight of the telescope around the shoulders and reduce the pressure on the neck. ?

A telescope is an optical instrument that uses lenses or mirrors and other optical devices to observe distant objects. The light passing through the lens is refracted or reflected by concave mirror into the pinhole to converge and image, and then it is seen through the magnifying eyepiece. Also known as "a thousand-mile mirror".

Common sense of telescope

About magnification?

This is the magnification of the telescope. When the human eye observes a distant object through a telescope, the telescope enlarges the opening angle of the object to the human eye, which makes the human eye feel that the object seems to be zoomed in and zoomed in, making it easier to distinguish it clearly. This is also the main purpose of the telescope. Therefore, choosing the appropriate magnification is the first important index for choosing a telescope.

Generally speaking, the greater the magnification of a telescope, the closer the object is pulled. Is the magnification of the telescope bigger, the better? Of course not. The higher the magnification of the telescope used for daily natural observation, the more uncomfortable the observation will be. This is because the human body is originally a micro-circulation exercise body. The hand holding the telescope produces irregular slight vibration due to breathing and pulse beating, which drives the whole observation lens to shake slightly. In addition, with the jitter of the airflow (about1"~ 2"), the amplified air impurities also form fuzzy moving images in the telescope system, which will give observers eyes.

Therefore, it is best to choose objects supported by the body and arms to ensure the observation quality when using products that are more than 10 times. Hand-held telescopes over 20 times are best fixed with tripods.

References:

Telescope _ Baidu Encyclopedia