FPV cameras. TVL vs pixels. What does it all mean?

When you look at a spec for an FPV camera it'll usually include something about TVL or TV lines, how large and how many mega pixels the sensor is and lots of other info. I think most of us know about sensor resolution and how many mega pixels a sensor is, but how does that relate to TV lines. The larger the TVL number the better, but what does it all mean.

In the good old CRT television days, video engineers devised a simple way to measure the horizontal quality of a camera with the standard EIA-1956 resolution chart like this.

TVL is defined as the maximum number of alternating light and dark vertical lines that can be resolved per picture height. So a resolution of 800 TVL means that 400 distinct dark vertical lines and 400 distinct white vertical lines can be counted over a horizontal span equal to the height of the picture. If we're using a 4:3 aspect ratio say 4cm by 3cm, 800 TVL means 400 vertical dark lines can be counted over 3cm width on monitor.

The inherent quality of camera will be affected by the optics, the sensor and to some extent the electronics and any software that processes the signal.

Basically the bigger the TVL number the better quality.

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Some great FPV cameras to have a look at.
Foxeer Falkor 2 : http://bit.ly/2Wa49E6
Foxeer Predator Nano 4 : http://bit.ly/31G3BHo
RunCam Robin: http://bit.ly/2VRr5bg
Caddx Turtle V2: http://bit.ly/2rPf7UD
Caddx Tarsier 4K: http://bit.ly/2N2KkMr
RunCam Split 3: http://bit.ly/2NOJdAa
RunCam Pheonix Oscar: http://bit.ly/2XhC1j4

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