How to choose security cameras

Camera focus length shows how close/narrow the camera shows objects. Comparative images from CCTV Direct:


The other criterion for choosing cameras is the resolution (pixel density) you need. Higher pixels may not always be the best choice, because they need more memory to store and more network resources, more budget to buy them. Generally, 1080 pixels are enough for a simple HD image, while 4K is recommended for recording everything perfectly.

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