By Resolution

For standard analog cameras, the resolution is measured by TV Lines.  For most new analog cameras the TVL range is 420 to 700.  Although 420 TVL is considered the lowest, I’ve seen camera systems where the user was only covering a short distance and the video quality was pretty good.  Don’t automatically assume a low res cam is garbage.  For short distances, the low-resolution camera could save you some money and put a good image up.  Now, the 600 TVL and above have excellent images.  The pictures are sharper and the contrast is great.

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