50mm Lens Demo Used On a 540 Ragecam Helmet Cam Hunting-Surveillance 50 mm m12x05 ccd
The choice of lens depends mainly on the type of video surveillance camera. Among the most commonly used are lenses with fixed focus distance. Standard values vary from 2.8 to 16.0 mm. In so called zoom lenses, the focus distance is up to 70.0 mm. The less the focal distance is, the wider is the vision of the camera.
Fixed focus distance lenses like 2.8, 3.6, 4, 6 and 8 mm are suitable for small video systems. In rare and specific cases, such as surveillance of the area around the cash register in shops in order to achieve resolution to distinguish individual notes" num="5" searchindex="12 or 16 mm are the best solution.
Zoom lenses are recommended for large sites where it is necessary to achieve high-resolution image of a great distance from the camera. For example, the entrances to stations or gates of factories and businesses where it is necessary to read the license plate number of the vehicle. Lens can be built into the camera or to be purchased separately. Choices are large and the optimum solution depends on the tasks to be assigned to the camera. Lenses are offered with fixed or variable focus, with options for automatic or manual focus.
Manually adjustable lenses are suitable for use inside the building and in combination with an electronic camera with regulating the amount of light falling on the sensor. This type of lenses is usually used in small spaces with constant level of illumination. It is believed that they are not suitable for installation in places which sunlight falls directly on the lens (near entrance doors or windows). Also, the absence of the diaphragm, which restricts the flow of light, makes a resulting image with low picture contrast even in good lighting. Therefore, this type lenses are not suitable for monitoring the area, which has objects at varying distance to the camera.
Kiril Petrov, http://www.TopSurveillance.info Team
How many people believe that there is nonlethal weapons testing on nonconsensual citizens in the U. S. now?
In the past we have been subjected to MKultra and Cointelpro operations without the knowledge of the congress. Today we are subjected to nonlethal weapons technology under the disguise of surveillance. Are you willing to support and take a stand for your rights and your families rights by writing to congress (Nancy Pelosi) and asking her to stop this practice? The testing of these weapons causes scars, marks and burns on people's bodies. Recently the Secretary of the AF wanted to use these weapons for testing on crowd control. Does this mean that if you are protesting that you could be subjected to these weapons? These weapons can cause contact lenses to melt to your eyeballs and pacemakers to stop working. Go to the AF website and read about these so called non lethal weapons that have the potential to cause serious bodily harm. Look up MKultra and see what has taken place before you discount anything.
Make sure to get a great TinFoilHat(tm) and get back on your meds.
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