This is the number of horizontal lines a camera can record and if you`ve done a bit of research already, you would be forgiven for thinking it's the holy grail of camera quality. It isn't.
Of far more importance is ensuring you use a camera with the right lens for your particular application. No amount of TVL will allow detail to be captured beyond the limitations of the lens. Wide angle equals poor detail capture as you move away from the camera.
At D1 resolution your DVR records at around 400,000 pixels per frame. You need the lens to concentrate enough of those pixels onto the subject in order to capture detail. If a 450TVL camera allows you to read a number plate at 8 metres then a 700 TVL camera with the same lens wouldn't be able to read it at any greater distance.
Notwithstanding the fact that TVL isn't a measure of how much detail a camera captures the numbers used are often very misleading. We see instances where the black and white night time resolution is quoted, not the day time colour resolution or simply a made up number.
Of far more importance is ensuring you use a camera with the right lens for your particular application. No amount of TVL will allow detail to be captured beyond the limitations of the lens. Wide angle equals poor detail capture as you move away from the camera.
At D1 resolution your DVR records at around 400,000 pixels per frame. You need the lens to concentrate enough of those pixels onto the subject in order to capture detail. If a 450TVL camera allows you to read a number plate at 8 metres then a 700 TVL camera with the same lens wouldn't be able to read it at any greater distance.
Notwithstanding the fact that TVL isn't a measure of how much detail a camera captures the numbers used are often very misleading. We see instances where the black and white night time resolution is quoted, not the day time colour resolution or simply a made up number.
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