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A high refresh rate (such as 50Hz) is best when choosing a thermal imager, and a high refresh rate will result in a smooth image when panning or tracking fast-moving objects.

Pulsar’s detection ranges are calculated according to Johnson’s criteria — a formula which defines the number of pixels that must be covered (3.6) to detect a man-sized object (1.8m high x 0.5m wide). Other parameters include recognition range, i.e. recognising the object is a human or vehicle, and identification range, i.e. identifying the type of car or whether the human is male or female.

The focal length of the lens, in combination with the thermal sensor, dictates the base magnification of the device.

Just like in photography, a lower aperture value (such as f1.0) is best in a thermal imaging device, capturing the greatest amount of heat and creating a high contrast, crisp image.

A device’s magnification is defined by the combination of its lenses focal length, the size of the thermal sensor and its pixel pitch, and its viewfinder resolution. However, a larger magnification does not necessarily mean a greater detection range.

All Pulsar thermal devices feature a digital zoom. As with all devices, zooming digitally will degrade the image, but products with a 12µm pixel pitch are less prone to degradation, as they offer almost double the number of pixels in the same area as a 17µm pitch.