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Surveillance lens application type
Due to the importance of the lens, before the monitoring and engineering design planning, only by first understanding the type of lens and its application methods, and understand the characteristics of its collocation application in order to achieve the best imaging lens. According to the current domestic classification methods, shots can be roughly classified into the following ten types.
Fixed aperture lens: fixed focus and fixed aperture, mainly used for ambient light fixed place;
Manual iris lens: fixed focus but adjustable aperture, mainly used for fixed ambient light but indefinite place;
DC-drive lens: fixed focal length, using a DC voltage to drive a fixed range environment for ambient light variability;
Auto-iris lens (Video-drive): fixed focal length, using a video signal to drive a fixed-range location for ambient light variability;
Manual zoom lens: It is mainly used in indoor environment where the degree of light is variable and the range is not the same;
Auto-aperture zoom lens: It is mainly used in outdoor environment where the ambient light is variable and the range is not the same;
On-Board lens: It is mainly used with infrared cameras, both indoor and outdoor;
Fish-eye panoramic lens: It is mainly used in indoor environment where the degree of light is indefinite and the size of the range is specific;
Electric zoom lens: It can remotely control the depth of focus and aperture of the focal length. It is mainly used in places where the indoor and outdoor ambient light levels are not constant and the depth of field range can be adjusted according to requirements;
Pin-Hole: Mainly used for concealed monitoring and ambient light with a range of specific places.
From the above lens classification we can see that the difference between the various types of lenses is mainly in their use and application environment requirements. Therefore, in the actual application of security monitoring, how to match the lens perfectly is also a big challenge for the engineering company.
Monitor lens failure
1, camera and lens imaging size does not match the lens imaging size is greater than the camera chip size, normal imaging, but the lens field of view angle will be less than the nominal angle of view; but if the lens imaging size is smaller than the camera chip size, the monitor will be around the picture There is a dark corner.
2. The mismatch between the camera and the lens interface does not match the distance between the second group of points of the lens and the camera chip. The actual focal length is not the nominal focal length of the lens, resulting in inability to focus. The standard gun camera interface and 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 must be added adapter ring; CS interface lens can not be installed on the C interface camera. The common gun type camera interface is usually designed as a CS interface, and it can be connected to a CS interface lens or an adapter ring to connect a C interface lens.
3, camera and lens aperture work drive or voltage mismatch Auto iris lens is usually divided into DC drive and video drive, the two work voltage is not exactly the same, this mismatch will cause the lens aperture can not be normally open, naturally it will not be able to Imaging. AVENIRETOKU Seiko engineers remind 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, misconnections or loose connections The monitoring camera, the lens, and the monitor will have various connections (if the device is connected with a pan/tilt head and a controller), these connections will be wrong or loose. , It will also cause the system to not work properly. We also remind everyone to carefully read the instruction manual of the equipment before installation.
The main reason for the unclear monitoring image screen
The main reason that causes the monitor image to be unclear:
1. Electronic Signal Interference The interior of the camera is a highly integrated system that is susceptible to interference from external electronic signals. If the monitor screen appears beating or streaking, the camera may be disturbed. Be careful to keep away from sources of electronic signal interference during installation.
2, the focus does not adjust the lens zoom adjustment to adjust the focus, in a certain depth of field (sometimes may be very small) can be focused clear, if you do not focus on the clear focus may not be adjusted to the best position.
3, dirty lens lens has dirt on the lens will directly lead to the monitoring screen blur, flu. AVENIRETOKU Seiko lens technicians remind everyone that the installation must be careful not to squeeze the ends of the lens by hand, so it is 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 tissue, a soft cloth, or alcohol (it is easy to destroy the film on the lens surface).
4. Problems 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 better to keep the default setting unchanged.
5, the back focus needs to adjust the so-called back focus (non-flange focal length), refers to the lens lens surface vertex to the focal plane distance. After the zoom adjustment, the screen is still unclear when the focus is adjusted to the optimal position (or the telephoto end of the lens is clearly focused and then the zoom is pushed to the wide-angle end to observe whether the wide-angle end screen is clear). This may be a problem of back focus.
Some cameras (or lenses) are equipped with a back-focus adjustment device, and some are controlled at a small range when leaving the factory. If there is no back-focus adjustment device and the back-focus problem is confirmed, the back-focus adjustment can only be added and added. Ring or replace the corresponding product.
6, camera or 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 that the resolution is consistent. If you use a standard definition analog camera, even if it is equipped with a million HD lens, the displayed image is still not clear; on the contrary, if it is an ordinary camera with a high-definition camera, then the camera's megapixel can not be reflected.
Use a good lens to reduce maintenance costs In security applications, because the front-end equipment is easily subject to environmental factors such as moisture, vibration, thermal expansion and contraction, etc., after a period of use, it is easy to cause the focus point shift to cause image blur, instability, Aging and other issues. Therefore, the cost of system maintenance must also be taken into account during construction.
The grinding mode is available on the AccuTOM-100 and can be used for all types of materials (multiple two-way finishes are used between x-direction movements to ensure excellent flatness). Two grinding methods are provided for precise control of material removal to achieve optimum preparation results.
Lens We are very familiar with security people, because we must always touch these things in our work. It is an integral front-end component of our security monitoring system installation work. The high performance of the monitoring system depends on the perfect match between the camera and the lens. In the monitoring project, if the user or construction staff lack of expertise, the camera and lens selection and installation are unreasonable, it will directly affect the overall effect of the system .