The lens is familiar to our security personnel because we have to touch these things at all times in our work. It is an indispensable front-end component of our security monitoring system installation work. The high performance of the monitoring system depends on the perfect combination of the camera and the lens. In the monitoring project, if the professional skills of the user or the construction personnel are insufficient, the camera and lens selection and installation are unreasonable, which will directly affect the overall effect of the system. .
Monitor lens application type
Due to the importance of the lens, before the monitoring engineering design plan, only the type of the lens and its application method can be found first, and the characteristics of the matching application can be understood to achieve the best imaging of the lens. In terms of the current domestic classification, the lens can be roughly divided into the following ten types.
Fixed aperture lens: fixed focus and fixed aperture, mainly used in places where ambient light is fixed;
Manual aperture lens: fixed focus but adjustable aperture, mainly used in places where ambient light is fixed but the brightness is uncertain;
DC-drive: A fixed focal length that uses a DC voltage to drive a fixed range of ambient light variability;
Video-drive: A fixed focal length that uses a video signal to drive a fixed range of ambient light variability;
·Manual aperture zoom lens: mainly used in indoor environment where the light level is variable and the range is different;
·Automatic iris zoom lens: It is mainly used in places where the ambient light level is variable and the range is different.
On-Board: It is mainly equipped with an infrared camera, suitable for indoor and outdoor use;
Fisheye panoramic lens: It is mainly used in indoor environment where the light level is variable and the range is specific;
Power zoom lens: remote focus depth and aperture can be remotely controlled. It is mainly used for indoor and outdoor environments where the light level is variable and the depth of field can be adjusted according to requirements.
Pin-Hole: It is mainly used for hidden surveillance and ambient light-specific and range-specific locations.
As can be seen from the above lens classification, the difference between various types of lenses is mainly in their use and application environment requirements. Therefore, in the practical application of security monitoring, how to perfectly match the lens is also a big test for the engineering business.
Monitor lens failure
1. Camera and lens imaging size mismatched The lens imaging size is larger than the camera chip size and can be imaged normally, but the field of view of the lens will be smaller than the nominal field of view; but if the lens imaging size is smaller than the camera chip size, the monitoring screen will be around A vignetting appears.
2. The mismatch between the camera and the lens interface does not match the distance between the second set of points of the lens and the camera chip. The actual focal length is not the focal length of the lens, which makes it impossible to focus. The standard gun camera interface and the lens interface should be the same as the C interface or the CS interface; the C interface lens must be attached to the CS interface camera with an adapter ring; the CS interface lens cannot be mounted to the C interface camera. Common gun camera interfaces are usually designed as CS interfaces, which can be connected to either the CS interface lens or the adapter ring to the C interface lens.
3, camera and lens aperture work drive mode or voltage mismatch automatic iris lens is usually divided into DC drive and video drive, the two working voltages are not exactly the same, this mismatch will cause the lens aperture can not open normally, naturally it can not Imaging. AVENIRETOKU Seiko technical engineer reminds everyone that when using the auto iris lens, the aperture converter on the camera should be driven to the nominal drive side of the lens, and the output voltage of the camera should be within the working voltage of the aperture.
4, connection problems, misconnection or loose interface monitoring cameras and lenses and monitors will have a variety of connections (if there are more devices connected with PTZ, controller), if these connections are wrong or loose It will also cause the system to not work properly. Here, I also remind you to read the instruction manual of the device carefully before installation.
The main reason for monitoring image is not clear
The main reason for the unclear monitoring image:
1. Electronic signal interference The inside of the camera is a highly integrated system that is more susceptible to interference from external electronic signals. If the monitor screen will appear beating or streaked, it may be that the camera is disturbed. Be careful to keep away from the electronic signal interference source during installation.
2. If the focus is not adjusted, the zoom adjustment should be adjusted accordingly. In a certain depth of field (sometimes it may be small), it can be clearly focused. If there is no focus, the focus may not be adjusted to the optimal position.
3. There are dirt on the lens. There is dirt on the lens, which will directly lead to blurring and sensation of the monitoring screen. AVENIRETOKU Seiko lens technicians remind everyone that when installing, be careful not to pinch the ends of the lens, which makes it easy to leave fingerprints on the lens. In case the lens is stained with fingerprints or dust, be sure to wipe it with a special wipe, instead of using a paper towel, a soft cloth and alcohol (it is easy to destroy the coating on the lens surface).
4. There is a problem with the electronic shutter or white balance setting. When the camera is shipped from the factory, the various adjustment devices are generally set at the optimal default position. If there is no special need, it is best to keep the default settings.
5, the back focus needs to adjust the so-called back focus (non-flange focal length), which refers to the distance from the apex of the last lens surface of the lens to the focal plane. After the zoom is adjusted, the focus is adjusted to the best position. The picture is still unclear (or focus on the telephoto end of the lens and then zoom to the wide-angle end to see if the wide-angle end is clear), which may be a problem with back focus.
Some cameras (or lenses) have a back focus adjustment device, and some are controlled to a small range at the factory. If there is no back focus adjustment device and there is a back focus problem, it can only be repaired and added. Reconnect the ring or replace the corresponding product.
6, the camera or the lens itself is not enough pixels The high performance of the camera depends on the perfect match between the body and the lens, the most important point is the same resolution. If you are using a standard-definition analog camera, even if it is equipped with a million high-definition lens, the displayed image is still unclear; on the contrary, if it is a normal lens with a high-definition camera, then the camera's megapixels will not be reflected.
Use good lens to reduce maintenance cost. In security applications, because the front-end equipment is easily interfered by environmental factors such as moisture, vibration, thermal expansion and contraction, after a period of use, the focus is likely to be blurred and unstable. Aging and other issues. Therefore, system maintenance costs must also be considered during construction.
Monitor lens application type
Due to the importance of the lens, before the monitoring engineering design plan, only the type of the lens and its application method can be found first, and the characteristics of the matching application can be understood to achieve the best imaging of the lens. In terms of the current domestic classification, the lens can be roughly divided into the following ten types.
Fixed aperture lens: fixed focus and fixed aperture, mainly used in places where ambient light is fixed;
Manual aperture lens: fixed focus but adjustable aperture, mainly used in places where ambient light is fixed but the brightness is uncertain;
DC-drive: A fixed focal length that uses a DC voltage to drive a fixed range of ambient light variability;
Video-drive: A fixed focal length that uses a video signal to drive a fixed range of ambient light variability;
·Manual aperture zoom lens: mainly used in indoor environment where the light level is variable and the range is different;
·Automatic iris zoom lens: It is mainly used in places where the ambient light level is variable and the range is different.
On-Board: It is mainly equipped with an infrared camera, suitable for indoor and outdoor use;
Fisheye panoramic lens: It is mainly used in indoor environment where the light level is variable and the range is specific;
Power zoom lens: remote focus depth and aperture can be remotely controlled. It is mainly used for indoor and outdoor environments where the light level is variable and the depth of field can be adjusted according to requirements.
Pin-Hole: It is mainly used for hidden surveillance and ambient light-specific and range-specific locations.
As can be seen from the above lens classification, the difference between various types of lenses is mainly in their use and application environment requirements. Therefore, in the practical application of security monitoring, how to perfectly match the lens is also a big test for the engineering business.
Monitor lens failure
1. Camera and lens imaging size mismatched The lens imaging size is larger than the camera chip size and can be imaged normally, but the field of view of the lens will be smaller than the nominal field of view; but if the lens imaging size is smaller than the camera chip size, the monitoring screen will be around A vignetting appears.
2. The mismatch between the camera and the lens interface does not match the distance between the second set of points of the lens and the camera chip. The actual focal length is not the focal length of the lens, which makes it impossible to focus. The standard gun camera interface and the lens interface should be the same as the C interface or the CS interface; the C interface lens must be attached to the CS interface camera with an adapter ring; the CS interface lens cannot be mounted to the C interface camera. Common gun camera interfaces are usually designed as CS interfaces, which can be connected to either the CS interface lens or the adapter ring to the C interface lens.
3, camera and lens aperture work drive mode or voltage mismatch automatic iris lens is usually divided into DC drive and video drive, the two working voltages are not exactly the same, this mismatch will cause the lens aperture can not open normally, naturally it can not Imaging. AVENIRETOKU Seiko technical engineer reminds everyone that when using the auto iris lens, the aperture converter on the camera should be driven to the nominal drive side of the lens, and the output voltage of the camera should be within the working voltage of the aperture.
4, connection problems, misconnection or loose interface monitoring cameras and lenses and monitors will have a variety of connections (if there are more devices connected with PTZ, controller), if these connections are wrong or loose It will also cause the system to not work properly. Here, I also remind you to read the instruction manual of the device carefully before installation.
The main reason for monitoring image is not clear
The main reason for the unclear monitoring image:
1. Electronic signal interference The inside of the camera is a highly integrated system that is more susceptible to interference from external electronic signals. If the monitor screen will appear beating or streaked, it may be that the camera is disturbed. Be careful to keep away from the electronic signal interference source during installation.
2. If the focus is not adjusted, the zoom adjustment should be adjusted accordingly. In a certain depth of field (sometimes it may be small), it can be clearly focused. If there is no focus, the focus may not be adjusted to the optimal position.
3. There are dirt on the lens. There is dirt on the lens, which will directly lead to blurring and sensation of the monitoring screen. AVENIRETOKU Seiko lens technicians remind everyone that when installing, be careful not to pinch the ends of the lens, which makes it easy to leave fingerprints on the lens. In case the lens is stained with fingerprints or dust, be sure to wipe it with a special wipe, instead of using a paper towel, a soft cloth and alcohol (it is easy to destroy the coating on the lens surface).
4. There is a problem with the electronic shutter or white balance setting. When the camera is shipped from the factory, the various adjustment devices are generally set at the optimal default position. If there is no special need, it is best to keep the default settings.
5, the back focus needs to adjust the so-called back focus (non-flange focal length), which refers to the distance from the apex of the last lens surface of the lens to the focal plane. After the zoom is adjusted, the focus is adjusted to the best position. The picture is still unclear (or focus on the telephoto end of the lens and then zoom to the wide-angle end to see if the wide-angle end is clear), which may be a problem with back focus.
Some cameras (or lenses) have a back focus adjustment device, and some are controlled to a small range at the factory. If there is no back focus adjustment device and there is a back focus problem, it can only be repaired and added. Reconnect the ring or replace the corresponding product.
6, the camera or the lens itself is not enough pixels The high performance of the camera depends on the perfect match between the body and the lens, the most important point is the same resolution. If you are using a standard-definition analog camera, even if it is equipped with a million high-definition lens, the displayed image is still unclear; on the contrary, if it is a normal lens with a high-definition camera, then the camera's megapixels will not be reflected.
Use good lens to reduce maintenance cost. In security applications, because the front-end equipment is easily interfered by environmental factors such as moisture, vibration, thermal expansion and contraction, after a period of use, the focus is likely to be blurred and unstable. Aging and other issues. Therefore, system maintenance costs must also be considered during construction.
Pvc Welded Wire Mesh,Hot-Dipped Galvanized Welded Wire,Pvc Coated Wire Mesh,Pvc Coated Welded Wire Mesh
Shenzhou City Hongda Hardware Products Co.,Ltd , https://www.galvanziedwire.com