The aperture of a lens, commonly known as the "diaphragm" or "iris", is the opening through which light enters the camera. The wider this opening is, the larger amount of light can reach the camera sensor, thereby influencing the exposure of the image.
A wider aperture (smaller f-number) allows more light to pass through, resulting in a shallower depth of field. On the other hand, a narrower aperture (larger f-number) reduces the amount of light entering the lens, leading to a greater depth of field.
The size of the aperture value is represented by the F-number. The larger the F-number, the smaller the light flux; conversely, the greater the amount of light. For example, By adjusting the aperture of the CCTV camera from F2.0 to F1.0, the sensor received four times more light than before. This straightforward increase in the amount of light can have several rather beneficial impacts on the overall image quality. Some of these benefits encompass reduced motion blur, less grainy lenses, and other overall enhancements for low light performance.
For most surveillance cameras, the aperture is of a fixed size and cannot be adjusted to modify the increase or decrease of light. The intention is to reduce the overall complexity of the device and cut costs. As a consequence, these CCTV cameras often encounter greater difficulties in shooting in dimly lit conditions than in well-lit environments. To compensate for this, cameras typically have built-in infrared light, utilize infrared filters, adjust the shutter speed, or employ a series of software enhancements. These additional features have their own pros and cons; however, when it comes to low-light performance, no means can wholly substitute for the large aperture.
In the market, diverse types of security camera lenses exist, such as fixed iris board lenses, fixed iris CS mount lenses, manual iris varifocal/fixed focal lenses, and DC iris board/CS mount lenses, etc. Jinyuan Optics offers a wide range of CCTV lenses with apertures ranging from F1.0 to F5.6, covering fixed iris, manual iris, and Auto iris. You can make a choice based on your requirements and obtain a competitive quotation.
Post time: Aug-28-2024