The Formatt Hot Mirror filter has been designed to correct Infrared pollution.
Unlike film cameras, digital cameras are sensitive to Infrared light. This becomes more noticeable when using neutral density filters especially when higher densities are used, as is now often the case with many (particularly top end) digital cameras.
The Formatt Hot Mirror filter has a sharp cut-off at Infrared wavelengths but will not interfere with the visible red wavelengths. The Hot Mirror coating is sandwiched internally to eliminate any possibility of damage to the coated surface.
About Formatt:
High quality glass filter for Motion Picture, Video and Broadcast Television Cameras.
The development of high definition ("HD") cameras and lenses and their increasingly widespread use has created a number of issues for cinematographers and DPs. Formatt Filters has accordingly developed a range of glass filters which have been specifically designed for HD.
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