varifocal lens
The video surveillance cameras on this page are all furnished with a high quality varifocal lens that allows an installer to adjust the field of view angle of the lens to the exact view that the installer needs. The wider the range of the camera lens, the more flexibility that it has. For example, a 6mm-60mm lens has a wider range of view than a 3.5mm-8mm.
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PC Based DVRs are versatile machines that give users more control and manipulation over their security cameras. One of the best things are bout PC based DVRs is the ability for them to grow as your security needs change. Initially when trying to setup a CCTV system, you need to plan out how you want to grow your system. Naturally it takes sometime to figure out what areas of your surveillance system may change. But unlike standalone DVRs you cannot expand them to add more security cameras. Some standalone DVRs have very limited graphical user inter-phase options too. In a very brief manner, PC based DVRs gives you some unique options for more involved CCTV applications.
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