The camera is designed to be user-friendly, and in most cases, you just need to mount the lens correctly, connect the signal cable, and power it on. However, improper installation or incorrect adjustment of the lens and camera settings can lead to suboptimal image quality. To ensure the best performance, it's important to follow a few key steps carefully.
First, when installing the lens, make sure it is compatible with your camera. Choose the right type of lens based on your application—such as fixed-focus, zoom, manual iris, auto-iris, standard, wide-angle, or telephoto lenses. Pay close attention to the lens interface: C-type or CS-type. Using a C-type lens on a CS-type camera without an adapter can damage the CCD sensor. Always double-check compatibility before mounting.
Once the lens is selected, remove the protective covers from both the camera and the lens. Gently screw the lens into the camera’s lens mount, ensuring it is securely fastened. For auto-iris lenses, connect the control cable to the corresponding port on the camera. If using a motorized lens (two-variable or three-variable), simply rotate the lens into position; there’s no need to adjust its balance until after focusing is complete.
Next, adjust the aperture and focus. Turn off the electronic shutter and backlight compensation for better control. Position the camera at the desired location and fine-tune the lens’s aperture and focus ring to achieve the clearest image on the monitor. In environments with changing light conditions, it’s recommended to use an auto-iris lens and set the electronic shutter to OFF. If using a manual iris lens, keep the electronic shutter ON. When the lighting is brightest, open the aperture as much as possible while still maintaining image quality—avoid overexposure.
After adjusting the focus, secure the lens with its protective cover and mount it on the bracket. Keep in mind that a larger aperture reduces depth of field, so focus should be adjusted to ensure the entire area is sharp. When light levels drop, the electronic shutter will slow down automatically, but if the aperture is too small, the image may become too dark.
In some cases, especially with fixed-focus lenses, you may not need to adjust the back focal length, as it is usually pre-set at the factory. However, if the image remains blurry even after adjusting the focus ring, check the lens interface first. If everything is correct, you may need to adjust the back focal length.
To adjust the back focal length, follow these steps:
1. Mount the lens properly on the camera.
2. Open the lens to its maximum aperture to reduce depth of field and improve focus accuracy.
3. Zoom in to a telephoto setting and focus on a close object (not more than 10 meters away).
4. Zoom out to a wide-angle view. At this point, the image may appear blurred, but this prepares the system for the next step.
5. Loosen the hex socket screw on the camera’s back focus ring. Rotate the ring (or the lens itself if no separate ring exists) until the image is as clear as possible, then temporarily tighten the screw.
6. Zoom back to the telephoto setting and check if the previously focused object is still sharp. Repeat steps 3–5 if needed.
7. Most adjustments require only one or two iterations to achieve optimal results.
8. Finally, tighten the screw and adjust the aperture to a suitable level for your environment.
Proper installation and adjustment are essential for achieving high-quality video surveillance. Taking the time to follow these steps ensures that your camera performs at its best under various lighting conditions.
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