**First, adjusting the lens aperture and focusing lens during installation**
Before starting, remove the protective cover of the high-definition surveillance camera and the lens cap. Then, carefully screw the lens into the camera mount. If the lens has a manual iris, make sure the camera’s electronic shutter is set to ON. At the installation site, choose the brightest lighting conditions (ambient light) and open the lens aperture as wide as possible while ensuring the image remains clear and not overexposed or washed out. This will help achieve the best focus. Once properly focused, replace the protective cover and secure the camera on the mounting bracket.
Keep in mind that when the aperture is wide, the depth of field is shallow. Therefore, you should focus carefully to ensure the entire area being monitored is sharp. When the lighting decreases, the electronic shutter will automatically slow down to maintain image quality. With a larger aperture, the image should still look good even in lower light. However, if you don’t open the aperture fully when there’s enough light, the electronic shutter may adjust to a slower speed, which could result in a better image on the monitor. But when the light becomes dim, and the lens aperture is small, the shutter might already be at its slowest (1/50s), leading to a darker image.
**Second, adjusting the back focus**
Back focus, also known as back focal length, refers to the distance between the lens and the CCD sensor when a standard C/CS interface lens is mounted. The factory usually sets this correctly for HD surveillance cameras, so for fixed-focus lenses, it’s generally not necessary to adjust the back focus. However, if adjustments are needed, follow these steps:
1. Mount the lens properly onto the camera.
2. Open the lens aperture as wide as possible to reduce the depth of field and make focusing easier.
3. Zoom in to the telephoto position, take a close-up shot of an object more than 10 meters away, and adjust the focus accordingly.
4. Zoom out to the wide-angle position. At this point, the screen will show a wider view, including the previously focused object, but you can’t adjust the focus now. If the image is blurry, that’s normal—it’s just preparing for the next step.
5. Loosen the hexagonal screw that holds the rear focus adjustment ring on the front of the camera. If the camera doesn’t have a rear focus ring, turn the lens directly to move the internal back focus ring. Rotate until the image is sharpest, then temporarily tighten the screw.
6. Zoom in again to check if the previously focused object is still clear. If not, repeat steps 4 and 5.
7. Usually, one or two iterations are sufficient to complete the back focus adjustment.
8. Finally, tighten the Allen screw and adjust the aperture to a suitable setting.
By following these steps, you can install a high-definition IP camera and perform a basic setup. After installation, check the monitor to see if the image meets your requirements. If issues persist, double-check the process or consult a professional surveillance technician for further assistance.
Lowe Insulated Glass,Acid Etched Glass,Window Insulated Glass,Sound Proof Insulated Glass
SHANDONG TOP LEADER GLASS CO.,LTD , https://www.topleaderglass.com