Many of my friends are wondering why the same focal length lens will be divided into ordinary lenses and infrared lenses. What is the difference between ordinary lenses and infrared lenses?
Next we will briefly explain the difference between the two: First of all, the use of the two is different: In the surveillance environment that does not require infrared light subsidies, an ordinary lens can be used. In an infrared light-subsiding surveillance environment, an infrared lens must be used for better monitoring effects; Can see the picture, but the picture will become blurred, this point 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 an ordinary lens. Why? Because the use of an infrared lens is both clear during the day and at night, and the effect is natural and expensive. Oh, this is nonsense. Finally, I talk about the reasons why the performance and price of the two are so different: Because the refractive index of the glass for different wavelengths of light is different, the position of the focused point will be different. Currently on the market, ordinary lenses can achieve the wavelength difference of about 250nm on the same plane, that is, 430 ~ 650nm or 650 ~ The light in the 900 nm range can be successfully focused and present a clear image. This is why the ordinary lens is clear during the day, the night vision is blurred, or the night vision is clear and the daytime is blurred. Professional-infrared lens uses special lenses, can achieve the 430 ~ 900nm or even longer wavelength range of the light gathered on the same plane, so regardless of the day or night vision is clear. Due to the special lens material, so the cost Naturally high. Professional infrared lens cost is high, new problems come again, everyone has to do a high cost of the machine, the profit is low, how to do? The people are very smart, do point coating to the lens, amend the light, hey, Cheap infrared lens comes out slightly ~ and no matter how good or bad, all are called - infrared lens! But how is the effect? How long will the coating be removed?... Will it be evaporated after being heated?... The plating is not as uniform as it should be, but sometimes it will be a little blurry. How can I do it? The goods requirement is not too high.. In any case, the best is cheap! We all recommend that everyone use good equipment, after all, a penny and a piece of goods, you buy it and use it comfortably, and we sell it comfortably. Although we just added more costs, our profits are the same, but if the equipment Praised by the majority of customers, the effect is different response. Finally, I wish you all a happy and prosperous business.
