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Formatt Hitech IR Cut filters are a hot mirror style clear filter designed to cut all near infrared light from 650nm and above, passing only light in the 400nm-650nm visible spectrum. This filter is used to retain color spectrum intended by the sensor manufacturer particularly when strong Neutral Density filters are used that do not have IR block/attenuation. This filter has a strong red/green appearance when viewed off-axis. While there is no color cast created by the filter when on-axis, the filter can create some color cast if lenses wider than 32mm are used on any sensor size.