[ Pacific Security Network News ]
Many friends are wondering about this question: Why do the same focal length lenses also divide the ordinary lens and infrared lens? What is the difference between a normal lens and an infrared lens?
Next, we will briefly explain the difference between the two:
First of all, the purpose of the two is different:
In a monitoring environment that does not require infrared light subsidy, an ordinary lens can be used; in a monitoring environment with infrared light subsidy, an infrared lens is required to have an ideal monitoring effect; of course, an ordinary lens is also used in infrared subsidy. I can see the picture, but the picture will become blurred. I believe everyone has a deep understanding.
Second, the prices of the two are different:
The price of a professional infrared lens is several times that of a normal lens. Why? Because the use of infrared lenses is clear day and night, the effect is natural and expensive.
Finally, let's talk about the reasons why the performance and price are so different:
Since the refractive index of glass is different for different wavelengths of light, the position of the focus point will be different. At present, ordinary lenses on the market can collect light with wavelengths of about 250 nm to the same plane, that is, 430~650nm or 650~ Light in the 900nm range can be focused successfully, showing a clear image, which is why the normal lens is clear during the day, the night vision is blurred, or the night vision is clear, and the daytime is blurred.
The professional infrared lens uses a special lens to collect light from 430 to 900 nm or even longer to the same plane, so it is clear whether day or night. Due to the special lens material, the cost is naturally high.
The professional infrared lens cost is high, and the new problem is coming again. The cost of the machine that everyone is doing is high, and the profit is low. What should I do? The Chinese are very smart. Do a little coating on the lens, correct the light, and the cheap infrared lens will come out. And no matter how good or bad, all are called - infrared lens!
But what is the effect? How long will the coating take off? Will it be evaporated after being heated? The coating is not so uniform, and sometimes it is blurred. What should I do? Reluctantly use it, don't ask too much for bargains.
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