In fact, in principle, the nature of the lens of the projector and the digital camera is the same, they are all optical lenses, and they all utilize the principle of light refraction, and all use the light-transmitting mirror. However, due to the different nature of the application between the projector and the camera and the different effects to be achieved, each of them will show a difference in specific details and functions.
In addition, for the projector lens, in addition to the difference in quality, the most critical parameter is the size of the aperture f, and f is the luminous flux of the lens.
How to choose the appropriate F value lens in actual use
The focal length of the lens determines the size of the image that can be formed under the condition that the distance between the projector and the screen is constant. The shorter the focal length of the lens, the larger the image projected onto the screen.
In the choice of projector, in the general application place, at the same price, the standard lens should be selected first. The standard lens is the best in color reproduction and image geometric distortion of the projected image! For small application space, for large-size projection images, short-focus lenses should be preferred. (Of course, if conditions permit, it is also possible to use a method of optical path refraction on a standard lens projector to obtain a large-size projected image. ).
For large applications, in the case of ample funds, the telephoto lens is preferred, because of the many advantages of this installation. First of all, the influence of the fan noise of the projector on the viewer is well suppressed, and then the influence of the viewer on the projector (the smoker's soot, the diners' food scraps, the hot drink steam), the telephoto projector The impact is minimal! This also creates a comfortable working environment for the projector, which is convenient for long-term operation of the projector.
The aperture value, when you select the projector, by comparing the aperture value of different projectors, you can know the power utilization rate of the projector product that you have determined. For projectors with different aperture values ​​but the same brightness, For projectors with a small aperture value (large aperture), the power of the lamp must be smaller than that of the projector with a large aperture value. Its significance lies in energy saving.
Under normal circumstances, different brands of high-end large projectors can generally change lenses according to the size of different image sizes and the corresponding projection distance. The lenses that can be changed according to different needs are: a wide-angle lens that is used to shorten the projection distance, a rear-projection wide-angle lens that is applied to shorten the rear projection distance, and a telephoto lens that is applied to extend the projection distance. These lens replacements with different focal lengths are very convenient. Generally speaking, the operator can complete it in 1-2 minutes without any tools.
At present, in the global industry, in addition to the development of projector lenses by a few digital cameras and projector manufacturers, most projector manufacturers use the lens part (optical components) to purchase the finished products produced by the lens manufacturers. . In the lens manufacturing of the lens, the most advanced optical glass processing technology is the optical glass lens molding technology, which is a high-precision optical component processing technology, which puts the softened glass into a high-precision mold and warms it. Under pressure and anaerobic conditions, the optical parts that meet the requirements of use can be directly molded at one time.
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