Infrared Photography Tips | Hiking Photography: "Now this is where you run into problems with modern digital cameras. Most will have an IR blocking filter that covers the sensor; some cameras block out more than others. This sensor IR blocking filter is there to prevent IR light from affecting image quality of normal photos. So when you put an a filter over your lens that ONLY lets through IR light, very little of that IR light actually makes it to the sensor because of the blocking filter. This results in the need for VERY long exposures; something in the 3-5 minute range depending on how strong that sensor IR blocking filter is."
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