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The designation 1/5" is another way of approximating the sensor size — see Why is a 1" sensor actually 13.2 × 8.8mm?. This matches the 2.8×2mm sensor area you've given — you need a lens which projects an image circle large enough to cover this. (In general, any larger format will work too — so, 1/4", or the 1/2.3", 1/1.7", or larger sensor sizes ...


My immediate thought is damaged sensor, but if hitting it helps, it is also possible a connection is loose or corroded and the bump makes the connection good again for a second. You might try taking the camera apart and reseat any connectors you can get your hands on. If that doesn't work, you could try to identify bad connections and reflow solder where ...

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