“I need four cameras for a field the distance of the cameras to the central is of 40 meters each and also I need that a camera is to a height of 20 meters and it is seen with good sharpness”
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Your question failed to give the important details -- width of the field, distance from (each) camera location to nearest point on the perimeter of the field, and "depth" (i.e., distance from front to back) of the field. The sharpness of the image is not a measure -- rather, the resolution of the camera and the ***effective*** focal length of the lens determine the field of view -- and determine the smallest object that is detectable / smallest identifiable image. Effective focal length is related to the height and width of the sensor in the camera versus the intended sensor size for which the lens was built. Thus, a 16mm lense may be either a wide angle or a telephoto depending upon the camera onto which it is mounted. This camera has a 75 degree field of view with a 3.6mm lens. You can learn to calculate the required lens (for cameras that allow lens changes) or the required Field of View (allowing you to match a camera to your requirement) here: https://www.edmundoptics.com/resources/application-notes/imaging/understanding-focal-length-and-field-of-view/
Sorry, there was a problem. Please try again later.The cameras included with this system have nightvision that will reach to a maximum of 130ft which is just about the distance to the field, adding the height makes that distance farther. Depending on what you need to view, the cameras may need to be positioned closer.
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