Film sensitivity
Different brands of infrared film are sensitive to different amounts of IR light. For example, Ilford SFX medium format film records infrared light down to 740nm on the electromagnetic spectrum, whereas Kodak HIE film – the most sensitive on the market – records down to 920nm.
As with regular photography, the more light there is the faster the exposure time, so if you are looking to use a higher shutter speed, it’s best to use film that records more infrared light.
