Varifocal bullet camera
Varifocal bullet cameras are cameras that have a special lens, where you can zoom in and out the lens. Doing this enable an end-user to change the field-of-vision and distance ratio. This is a very handy feature for when situations suddenly develop or if you relocate a zone of security and need a different video shot. There are many different ranges of vari-focal bullet cameras. There are some ranges from 2.5mm to 12mm, 3.5 - 8mm, 4mm to 9mm, and long distances ranges from 8mm to 29mm. All of these vari-focal bullet cameras are made for specific purposes. Measure out your schematics and use of security camera lens calculator to help determine the range you need for your video shot.
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