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How to choose a telescope?
Release time:2017-12-13 browse:515second

The telescope is an important and indispensable tool for every outdoor enthusiast. But many of you don't have much knowledge about the performance of the telescope and how to choose the telescope. So the telescope doesn't have many uses or the effect is not satisfactory. Here, I'll show you how to select a telescope.

The type of binoculars (Porro Prism vs Roof Prism)

The binoculars can be divided into two major categories: the prism (Porro Prism) and the ridge prism (Roof Prism). The structure of the pro type is simple and the transmittance is higher than that of the same ridge type. Due to the wide distance of the objective lens, the image is more stereoscopic, and the selling price is generally cheaper because of the low technological requirement. The relative structure of the roof type is more complex. It needs high accuracy and is not easy to develop, and the cost and the selling price are all high. The two prisms become a straight line to make the volume smaller, the handle is better, the sealing performance is better, and the recent focus is shorter than the pro type.

Telescopes can usually be divided into four types:

Handheld binoculars;

Single tube bird mirror;

Giant binoculars;

Single tube astronomical telescope;

Select the telescope, do not be superstitious advertisements or indicators, please use the eye to compare and choose.

optical performance

The 1. rate (suitable for 8 to 10 times)

The telescopes are marked with 10 x 42, 8 x 32 and so on. The former represents the multiplex and the latter represents the diameter of the objective lens. Use 10 times the telescope to see a bird standing at 100 meters, just as close as the naked eye at 10 meters. The smaller the magnification, the smaller the angle of view, the more difficult to search for, and the sharpness of the trembling of the hands. When the light is very sufficient, it is 10 times more clear than 8 times; when the light is not enough, the details can be seen more than 10 times, so the high rate should not be blindly pursued.

2. caliber (suitable for 28mm to 42mm)

The larger the caliber is, the diameter of the object lens affects the amount of light intake. Especially in the contrasting, twilight, cloudy conditions, the greater the diameter, the higher the amount of light into the eyes, you can see more details; but at the same time the telescope will weigh more, long time watching is easy to cause fatigue. It is advisable to select large caliber according to the human body.

3. view (the greater the better)

The field of vision refers to the range that can be seen at 1000 meters. The width of the field of vision is more than 104 meters, or 6 degrees. The vision is bigger, faster and more difficult to search the target. The more serious the edge distortion and fuzziness are, the more complicated the aberration correction will be, the more the technology and the cost are needed.

Now, major international brands have been putting a lot of effort into expanding the vision of the telescope. Especially the mini portable telescope telescope in the rise of the market, the pursuit of small volume, large demand is more and more intense, the traditional 10X25 Mini telescope because of small caliber, the traditional design is not reasonable, resulting in very small vision. In this mini expansion telescope's field of view, the most successful is the Dr. 8X32 trophy, with ultra small size, super vision, super clear, won the world's Mini telescope in 2011 40% customers have been recognized, the national market share topped the sales champion Mini telescope. The index of the telescope 8X32 is only a large palm and a weight of 400G. The field of vision reaches the vision of the traditional 7X50 telescope. At the same time, the ultra high definition lens and coating are used. It's called a revolutionary product by the industry. The next picture is the doctor's trophy 8X32.

4. color fidelity (the better the more natural)

The high quality telescope must faithfully reflect the original color and color saturation of the scene. Some manufacturers in order to increase the brightness of the telescope, deliberately increase or decrease a certain section of light wave, resulting in distortion, so that the scene is blue or red.

The relationship between the transmittance and the coating is inseparable, and directly affects the color fidelity. All optical glass has high transmittance and full surface multilayer coating, with high brightness and accurate color reduction. General manufacturers will not publish all the data (hard to do). Some manufacturers will publish the transmittance or coating of local optical glass, so as to mislead consumers.

The best way is to use your own eyes for observation and comparison.

Performance

1) depth of field

For bird watching people, the depth of field is a contradictory parameter. When the depth of field is large, it doesn't need frequent focusing, and it is more convenient to use. But for observation of forest birds, the foreground and background are not easy to be fuzzy, and birds are not easy to stand out. While the depth of field is small. Although the bird's theme is prominent when observing the forest and bird's foreground and background is obvious, but it needs to focus again when it changes. It depends on personal preferences, and there is no fixed standard.

All currently on the market the so-called automatic focusing telescope, is realized by increasing the depth of field, on the market there is no real automatic focusing telescope, the telescope is really AF need battery as power, also need built-in chip, realize the goal of judgment. There are no such telescopes on the market at present. To put it another way, the foreground and background of the autofocus telescopes are not easy to be virtual, which will affect the remote small targets of the observation bird (which is easily confused with the background).

This is known as the Steiner 5810, automatic focusing telescope.

2) sealing property

Telescopes are often carried out in the open air. The environment of observation is changeable. It is better to choose a telescope that can prevent water immersion (water pressure and water proof), so that the mirror can keep sealed and stable, and it doesn't fog and grow mouldy.

3) comfort

Comfort varies from person to person. Generally speaking, the telescopes with surface coating are not only good in shockproof, but also good in shockproof.


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