Traditional Culture Encyclopedia - Photography and portraiture - Where can I buy binoculars in Taiyuan?
Where can I buy binoculars in Taiyuan?
Process telescope, generally 150 or so, if it is better, it may be 400-500. No matter how expensive, there is no need to buy it.
Matters needing attention when selecting:
1. In fact, when purchasing a telescope, the hand-held magnification should not exceed 12 times, and 8 times is the best. If it exceeds 12 times, it will shake endlessly and cannot be seen clearly. Military hand-held telescopes are mainly 8 times, but there are few 12 times. The size of a military telescope is 20 times that of a box, and it is installed on a special tripod when used. Such a large magnification is unstable to hold with your hands. Moreover, the larger the telescope, the greater the depth of field and the larger the volume. 20 times the military telescope is almost half a meter high and about 25 kilograms.
Don't believe that the telescope has night vision function. There are currently three generations of night vision goggles. The first generation is fluorescent night vision goggles, which put fluorescent lenses in the sun during the day and look through them at night. The effect is poor and the working hours are not long. The principle is the same as that of a fluorescent watch, which can be excited by strong light for five or six minutes in the dark. This generation has been eliminated at present. The second generation is a low-light night vision device. Is to increase the objects in starlight and moonlight by thousands of times and tens of thousands of times. This function is far away, and you can see hundreds of meters. This generation will also be eliminated at present. The third generation is the thermal imager, which finds the target according to the temperature difference between the object and the background. This situation is very common now. The second generation of night vision equipment also costs tens of thousands, and the third generation is more expensive.
3, the lenses are red, and the light blue ones are not needed. This is a layer of decorative metal.
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