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  • Surveillance camera lens assembly the common problem

        The focal length of the optical system is the principal point to the focal point of light set distance . The lens focal length lens combination is actually constitute a focal length of the light group , which determines the size of the image pickup , with different positions of the same focal length of the lens when the imaging of objects , with a long focal length lens of the scene captured by the camera on the size of large , on the contrary , with a short focal length lens of the scene captured by the camera on the small size .
        Refers to surveillance camera surveillance camera lens , because only a single surveillance camera video capture device , camera pixels and resolution than your computer´s video head to be high, but can not keep up professional digital camera or DV.
        In practical applications , there is often made ​​to the camera user can see how far the object or the camera can see how wide scene etc. , which is actually to be determined by the focal length of the lens used to determine , and also with the selected camera resolution, and resolution of the monitor .
        The focal length of the optical system is the principal point to the focal point of light set distance . The lens focal length lens combination is actually constitute a focal length of the light group , which determines the size of the image pickup , with different positions of the same focal length of the lens when the imaging of objects , with a long focal length lens security surveillance camera scene ingested size is large , on the contrary , with a short focal length of the lens of the scene captured by the camera on the small size .
        Theoretically , any kind of camera can shoot very distant objects , and in the camera´s imaging target surface into a small image, but subject to the restrictions of pixels when imaging small to less than one pixel large image sensor hours , no longer able to form the subject image of the object , even if there are several image pixel size of the image is difficult to discern why the matter .
        The construction and installation techniques for the lens is not unfathomable , but in the construction process, due to various reasons , the lens construction and installation errors are common , so that the lens structure or circuit damage. So, these common problems are mainly what it contains ?
        Lens Adapter Ring assembled in the wrong order
        Lens Adapter Ring assembly sequence is the engineering staff at the biggest blind spot on the lens mount , and the resulting direct consequence of damage to the lens . Since C and CS lens mount mating ring when there are applications, and many engineers are often connected with the first combination locking ring and the camera first and then, and then lock the lens into the mating ring , and some will be in the design of the lens a sliding structure to fit the camera back focus (BackFocus) loosening the adjustment screw on the camera , or mechanical back focus adjustment , these adjustments required under the lens can be rotated on the mating ring or ring together with the mating drive in order to obtain the best focus clear point . But because the engineers assembled when sorting errors , making the mating ring deadlocked on the lens side . Thus, in the absence of auto back focus (ABF) function case, connected with loose ring , not only unable to rationally adjust back focus , or even due to pressure caused by improper lens thread wear or plastic material on the lens holder twisted thread broken .
        Lens assembly did not take the gloves resulting coating damage
        In the lens assembly process, the most frequently occurring construction engineers fault that is not wearing gloves or protective coating causing damage . Part of the project due to lack of personnel to protect the lens ( the lens cap fitted for installation ) and the construction of optical components for precision equipment or facilities for the protection and care of consciousness , and thus often find that when assembled lens lens surface has its own fingerprint residues or other dirt. Seasoned engineering staff will fetch the appropriate chlorine dioxide and lens cloth to wipe or deerskin , however there are still some people out simple, choose clothes touch or improper paper towel , and its not only on the lens surface of the lens coating cause damage , but also hurt the video screen and the lens "vitality ."
        Lens protection cover is not installed in the left window to the appropriate spacing
        Installation of electric lens, most likely to be negligent is the lens protection cover is not installed in the left window to the appropriate spacing. After construction engineering staff to do the depth of field or focus adjustment, sometimes find that the screen can actually see the video surveillance camera or the lens itself, the image reflected in a protective cover . At this point , even by manipulating the depth of field (ZOOM) or adjust the focus (FOCUS) still can not change the screen twist . Inexperienced engineers will mistakenly think that the camera itself is not adjusted, then the real protection for the lens hood in pitch caused by installation errors .
        Without the proper lens be assembled
        In the lens assembly process, most of the engineering staff will carefully assembled lens. Lens expensive, the slightest mistake caused damage to the lens , escape the blame . However, some engineers at the camera and lens assembly lax protection, and even choose the location on the site . In the absence of other preventive measures to protect padded case, can easily cause damage to the lens exterior , interior aperture shutter plates damaged or sand attached to the lens .
        Connect the auto iris lens assembly line welding error
        The efforts of the lens manufacturer , type of lens has been achieved mostly pre- processing lines and connectors , this way, similar to the errors caused by line welding lens servo motor burned exist. However, some electric supply or field lens protection cover because there are some flaws with so skilled engineers still need to understand and these subtle circuit wiring and welding technology . The author has found that in a project appear in all auto iris lens drive circuit shorted joint welding accident , which brings to the project applied for a great loss and cost consumption , as contractors have to prevent such problems.