Solutions to some fundamental queries about night vision gear
1. When will you use night vision products?
---Used for leisure and entertainment, such as camping, traveling, fishing, boating, or natural observation. Other uses include surveillance, search and rescue, and security purposes.
2. What are the differences between different generations of night vision products?
---The main difference lies in the advancement of booster technology. The first generation uses an intensifier tube to enhance the brightness of the surrounding environment, which can accelerate the flow of electrons to hit the phosphor surface, just like the principle of a TV screen. Generation II devices, on the other hand, added a micro-frequency disk, which increased the number of electrons striking the phosphorous surface, thereby enhancing brightness. Gen III devices add a gallium arsenide photocathode, which produces a higher number of photoelectrons than Gen II. Both the second generation and the third generation have made great progress in increasing brightness, but their prices are relatively expensive, which discourages most customers. The quality of the first generation is good, and its brightening effect can also meet the needs of most ordinary users and many professional users, so it has a market.
3. How does the night vision device work?
---Night vision products focus the light on the image intensifier through the eyepiece to collect and intensify the existing light. Inside the intensifier, a photocathode will be "activated" by light and convert photon energy into electrons. These electrons pass through An electrostatic field inside the intensifier is accelerated and strikes the phosphor surface screen (like a green TV screen), creating an image visible to the naked eye. Through the acceleration of electrons, the brightness and image clarity are enhanced.
4. What is the optimal range of the night vision device?
---Approximately within the range of 10-400 feet. *Maximum viewing distance depends on the use environment, such as cloudy weather, fog or rain, etc., will shorten the range of the night vision device. Infrared emitters can increase the range, especially when used in enclosed areas like warehouses, caves, etc.
5. Why does the night vision device not have a zoom function?
---The more the image is enlarged, the more light is lost.
6. Why focus on both the front part (objective lens) and the eye piece (eyepiece)?
---The short answer is that you are not looking through the night vision device, you are actually seeing the phosphor screen at the bottom of the tube. The objective lens focuses the image in front of the intensifier tube, which converts the image into a stream of electrons, which are then reimaged at the bottom of the tube. To see a clear image, you need to focus your eye on the bottom of the intensifier tube where the image is formed. Everyone's eye vision is different, so eye focus is also very important. Focus the line of sight first, and then transfer to the objective mirror to ensure a clear image. Also, you'll need several shots of each prism to get the sharpest image.
