Views: 3 Author: Site Editor Publish Time: 2022-10-28 Origin: Site
1: Telescope multiple: Each telescope is marked with its main parameters, such as 7x35, which means that the telescope is 7 times, and the telescope objective lens diameter is 35mm. Generally less than 6 times is low magnification, 6-10 times is medium magnification, and more than 10 times is high magnification. Many people always think that the higher the better for telescope magnification, and some telescope manufacturers also attract consumers with falsely high magnification. Appropriately higher, the observation with a tripod can be higher than the handheld observation. If you buy hand-held observation binoculars, between 7-10 times is enough, and the maximum should not exceed 12 times.
Otherwise, the higher the telescope multiple, the smaller and darker the observation field, and the observation effect will decrease, especially if the high magnification brings The jitter of the camera is also greatly increased, so that the observed scene cannot be stabilized, and it is difficult to observe normally. Although there are many kinds of telescopes equipped by the armed forces of the United States and Russia, most of them are mainly 6-10 times. Some world famous brands such as Zeiss, Nikon and other telescopes also have medium magnification. This is because a clear and stable telescope. imaging is the most important.
2: Telescope aperture: The larger the telescope aperture, the smoother the observation and the greater the brightness, which is conducive to the observation in dim light, but the larger the telescope aperture, the larger the volume and weight, and the higher the cost. Choose between -50mm telescopes.
3: Telescope field of view: The field of view refers to the field of view that can be observed at a kilometer, such as 1000/93M, which means that the telescope can observe a range of 93 meters at a distance of 1,000 meters, and can also be converted into "degrees" to express is 5°30'. The comparison of the size of the field of view of the telescope must be carried out under the conditions of similar aperture and the same multiple. The key to the size of the field of view lies in the design of the eyepiece part of the prism system. Generally, the advanced varieties of famous factories and military telescopes are designed with a wide-angle large field of view. Wide-angle wide-field telescopes will give people a feeling of spaciousness, comfort and relaxation.
4: Telescope coating: The function of telescope lens coating is to reduce reflection, increase the light transmittance of the telescope, and improve the observation brightness. The color of the telescope coating has nothing to do with the quality. The lighter the coating, the less reflective the better. However, in recent years, there have been various red and yellow film telescopes with strong reflection and sparkling in the market, which are very attractive to consumers. In fact, this kind of inferior quality The reflection of the coating loses a lot of light, which makes the color colder and darker, and the clarity decreases. What's more, some people even call this inferior red film telescope "dark night vision" and "infrared night vision telescope" to deceive consumers. , In fact, the real infrared night vision device is photomultiplier tube imaging, which is completely different from the principle of the telescope. It cannot be used during the day, and it is expensive and requires power to work.
5: Telescope structure material: In order to reduce costs, most ordinary telescopes on the market use plastic mirror bodies and lens barrels. Only a few high-end products and military models use all-metal structures, which are expensive, but their sturdiness and durability are unmatched.
6 : Rangefinder function of the telescope: Military rangefinder type telescope in the right eyepiece