Filter Infrared Infra
what wavelengths do tungsten bulbs stop emitting at? ir pass filter?
i've heard that infra red light starts at about 800nm and also that certain other types of light emitted from bulbs, eg sodium, mercury etc only emit light upoto certasin freqencies. i think tungsten emits lights into the range of infa red (730nm +) but what does it stop at. Im trying to find a infra red pass filter to put in front of a camera to take a photo of a car number plate with its head lights on using an infrared lamp and an infra red filter. the idea is the filter will block the headlight glare but dont know what frequency filter is required? any help?
Car headlights put out an huge amount of infra-red. This will dazzle your camera with any IR filter.
You will find that radiation emitted from tungsten is a broad spectrum, usually peaking somewhere near yellow and falling off in a bell shaped curve for a long way in both directions. There is no sharp cut off.
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