Choosing a telescope is an extremely entangled matter. Due to the lack of knowledge of telescopes, they search for knowledge indiscriminately on the Internet, and eventually become more confused and even misled. Unscrupulous merchants use this to produce inferior counterfeit products. Use shoddy to make a huge profit. So how can we distinguish inferior telescope products?
How to distinguish inferior telescopes:
Generally speaking, inferior telescopes have several typical characteristics:
- The weight is very light. This is because a large number of plastic parts are used to reduce costs, and the density of plastic is very low.
- It is coated with red film, which can falsely claim that the telescope has infrared night vision function.
- The appearance is colorful, so you can falsely claim that it is military binoculars. In fact, the real military binoculars are basically black.
- Looking dizzy for a long time, this is because to improve the output, there is no time to correct the parallelism of the optical axis of the two lens barrels.
- The packaging is simple and there are no products.
- The sales location is in the small commodity wholesale market or mobile vendors.Buying low-quality telescopes not only suffers economic losses but also damages eyesight when used for a long time.
So how to choose a telescope?
- 1. Magnification (should be between 8 times and 10 times)
The telescopes are marked with words such as 10×42 and 8×32. The former represents the magnification, and the latter represents the diameter of the objective lens. Using a 10x telescope to see a bird standing at 100 meters is as close as looking at 10 meters with the naked eye. Because the magnification is too large, the viewing angle is smaller, it is more difficult to find the target, and it is easier to affect the clarity due to shaking hands. 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, so high magnification should not be blindly pursued.
- 2. Caliber (should be between 28mm and 42mm)
The larger the aperture, the better, and the diameter of the objective lens affect the amount of light entering. Especially in the case of strong contrast between light and dark, morning and dusk, and cloudy, the larger the aperture, the higher the amount of light, the more details can be seen by the eyes; but at the same time, the heavier the telescope, long-term observation is more likely to cause fatigue. It is advisable to choose a larger caliber according to personal physical fitness.
- 3. Field of view (the bigger the better)
The field of view refers to the range that can be seen from 1000 meters, and the width of the field of view should be higher than 104 meters or 6 degrees. The larger the field of view, the quicker and easier it is to search for the target. However, the larger the field of view, the more severe the distortion and blurring of the edges, the more complicated and difficult the correction of aberrations, and the higher the technology and cost required.
- 4. Color fidelity (the more natural the better)
High-quality telescopes must faithfully reflect the original colors and color saturation of the scene. In order to increase the brightness of the telescope, some manufacturers deliberately increase or decrease a certain section of light waves, causing distortion and making the scene blue or red.
Performance
- 1. Depth of field
For bird watchers, the depth of field is a contradictory parameter. If the depth of field is large, there is no need to adjust the focus frequently, which is more convenient to use. However, for the observation of forest birds, the foreground and background are not easy to blur, and it is not easy for birds. prominent. The depth of field is small. Although the foreground and background are obviously blurred when observing the forest birds, and the bird theme is prominent, the focus must be adjusted again when the distance changes and the fingers must always be placed on the focusing wheel, which is more tiring. This depends on personal preference, there is no fixed standard.
All the so-called auto-focusing telescopes currently on the market are realized by increasing the depth of field. With auto-focusing telescopes, the foreground and background are not easy to blur, which will affect small distant targets such as the observation bird (it is easy to merge and confuse with the background. ). If you are not bird watching, choosing an auto-focusing telescope is still very practical. (The telescope is currently an auto-focusing telescope)
- 2. Tightness
Telescopes are often carried out outdoors, and the observation environment is changeable. It is best to choose a telescope that is waterproof (water pressure and waterproof) so that the inside of the mirror can be kept sealed and stable without fog and mildew.
- 3. Comfort
The comfort varies from person to person. Generally speaking, for a telescope with a rubber surface, not only is it shockproof, but it is also more comfortable to hold; the weight of the lens body determines whether it is convenient to use and carry for a long time; usually, people will choose a telescope with high durability