How to Install and Adjust the CCTV Cameras?
The use of cameras is very easy. Before it works, we should install the lens correctly, adjusting lens aperture, focus, and back focus, connect the signal cable and put through the power resource.
But in the reality, if we can not fix the lens and adjust the camera and lens, maybe we won’t get the expected result. The followings are to introduce the right method how to use it.
1. Fix the lens：
The camera should be equipped with suitable lens before use according to the conditions. The lens includes Fixed Focal Lens or zoom lens, auto and manual aperture lens, standard, wide-range, telephoto lens and so on. Besides, the mount also should be taken more attention; it is C or CS types. The difference between them is different flange back; C is longer than CS mount. C-Mount lens, as well as CS-Mount, is 1 inch diameter with 32 TPI (threads per inch).
- 1) Unload the interface cover.
- 2) Revolve the lens till tightly.
- 3) Insert the lens plug into LENS socket. (Omit when fix the manual control diaphragm lens)
- 4) Revolve the focal distance, adjust the screw and adjust the focal distance according to the type of the lens.
2. Adjust the aperture and focus:
Turn off the electronic shutter and back light compensation and other switchers, make sure the chart on the CCD, and adjust the aperture and focus to make the image on the monitor best. If the cameras will be used in various light conditions, it is better to equip the auto aperture and turn off the ELC. If manual aperture is chosen, turn on the ELC. After adjusting lens, housing and bracket should be fixed too.
F stop or aperture: The lens is fully opened, the depth of field is at its minimum, causing objects that were in focus during the day to be out of focus at night, when it’s set to the minimum F Stop (or maximum aperture). Just before the lens closes, it is at the maximum F Stop (or minimum aperture). A low minimum F stop means that more light can pass in dark conditions, producing better quality images at night. A high maximum F stop is generally needed in locations where there are high levels or light or reflection.
3. Back focus adjustment
In many cases, you will not be required to adjust the back focus when you change a lens. You will need to, if the lens does not hold focus at both ends of the zoom range.
By adjusting the back focus, you are changing the distance between the rear of the lens and the CCD chip of the camera. Not all lenses have a back focus adjustment however.
Adjusting the back focus
Before starting, put the camera on a tripod and adjust your camera's viewfinder so it is in sharp focus. Ideally, you'd want a test pattern chart (looks like a dart board) to be at least 75 feet from the camera, therwise, as far as possible. If you don't have a test chart, Use a page from a magazine.
- 1. Set the iris to manual.
- 2. Set the zoom to manual.
- 3. Open the iris to its widest aperture. If the illumination on the test chart is too bright for the open iris, reduce the light or move the chart to a darker area.
- 4. Turn the zoom barrel to extreme telephoto.
- 5. Focus on the chart.
- 6. Set the zoom to wide angle.
- 7. Loosen the back focus ring retaining knob.
- 8. Adjust the back focus ring for the sharpest focus.
- 9. Repeat steps 4 through 8 until focus is consistently sharp.
- 10. When it is, tighten the back focus ring retaining knob to secure the ring.
Note: Most lenses are at their sharpest focus at about a middle iris position.