CHANCCTV-OPTICSLENS

A fisheye lens is an extreme wide-angle lens that introduces barrel distortion to "compress and deform" the physical space, thereby obtaining an ultra-wide-angle image with a field of view of 180 to 270 degrees. Although there are large differences between the object and the image, the resolution is not affected, and the one-to-one correspondence between the object point and the image point can be guaranteed, so that a clear image over a large area can be achieved. To achieve the widest possible field of view, the front element of this type of lens protrudes forward in a parabolic shape—resembling a fish's eye—hence the name "fisheye lens." Most fisheye lenses are fixed focus lenses, with only a very small number being varifocal lenses. Due to their ultra-wide-angle characteristics, fisheye lenses play a significant role in fields such as astronomy, meteorology, forest fire prevention, and national defense. 1. The imaging principle of fisheye lenses The visua...

Focal length is one of the core parameters of CCTV lense s, which essentially determines the field of view and the clarity of details in the image. Simply put, a shorter focal length brings the image closer while providing a wider field of view, whereas a longer focal length captures more distant scenes but results in a narrower field of view. 1. The impact of the focal length of a CCTV lens on the image Overall, the focal length of a CCTV lens affects the image in the following key ways: 1) Field of view The field of view is the range of the visible image. A shorter focal length means a wider field of view, covering a larger area, which is suitable for small spaces or scenarios that require panoramic monitoring. A longer focal length means a narrower field of view, which can zoom in on the image and see details of distant objects, but the coverage area is smaller. 2) Monitoring distance and detail clarity At a fixed monitoring distance, a shorter focal length provides a wider field...

As a core component of industrial microscopes, industrial microscope lenses are also key parts of machine vision inspection systems and precision measuring equipment. They are mainly used for close-range, high-precision observation and inspection of workpieces, and their key parameters directly determine image quality and applicable scenarios. In this article, we will learn about the relevant knowledge of industrial microscope lenses. 1. Main parameters of industrial microscope lenses The main function of industrial microscope lenses is to magnify tiny objects, making their details clearly visible for easy observation, analysis, and measurement. When selecting and applying them, the following key parameters should be considered: (1) Magnification Magnification refers to the number of times an image is magnified relative to the actual object, directly affecting the lens's field of view and detail resolution. Common magnification ranges from 0.5× to 200×, with 2×, 4×, 5×, 10×, and 2...