Datasheet ranges are measured in good conditions against a reflective scene. Rain, dark surfaces and a dirty dome all shorten them.

What does marginal mean?

Inside the datasheet figure, but outside the margin. It may work, so test on site or add light.

Does this say what I can identify at night?

No. It says whether the scene is lit. Lens & DORI tells you the pixels per metre at the same distance.

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Pick a camera and a distance. Compare with the datasheet range, with a margin for real conditions.

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Distance to the scene

IR range · not in datasheet, enter manuallym

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No IR range in the datasheet. Enter it by hand, if you know it.

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Why a 20 % margin?: Datasheet ranges are measured in good conditions against a reflective scene. Rain, dark surfaces and a dirty dome all shorten them.
What does marginal mean?: Inside the datasheet figure, but outside the margin. It may work, so test on site or add light.
Does this say what I can identify at night?: No. It says whether the scene is lit. Lens & DORI tells you the pixels per metre at the same distance.