IR scopes can use regular optic lenses and an regular CCD sensor.
A handheld thermal thingee has a special type of CCD sensor that is sensitive to thermal frequencies. These are a different chemistry to the regular silicon based CCDs that all regular digital cameras (visible and IR) use.
A thermal scope has this expensive thermal-specific CCD in it, AND the optic lenses that do the magnification are made of a special glass that allows the thermal frequencies to pass through, unlike regular glass.
The cost is in the special thermal CCD sensor, and the special thermal lenses.
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