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Tiffen International offers T1 IR filters to eliminate infrared light pollution (27/11/2009)

Tiffen International has developed a new range of optical filters to remove the infrared light that can affect cameras using CMOS and CCD image sensors. The new T1 IR filters are manufactured to high standards to effectively eliminate IR pollution and, only having a half-stop of attenuation, can be used as fix-and-forget extras.

T1 IR filters allow cameras to capture the full range of subtle red hues while maintaining crisp blacks and the entire wide colour gamut the cameras were designed for. The filters use Tiffen's ColorCore technology with each effect captured between two pieces of glass, so the surfaces can be ground and polished to provide perfect parallelism. They contain no dichroic coating and so will not vignette green, magenta or cyan at wide angles. Filters are available in 77mm (thin profile wide-angle ring), 138mm, 4x4, 4x5.65 and 6.6x6.6 with other sizes supplied on request.

T1 IR filter performance has been tested with Sony EX1 and EX3 digital video cameras. The cameras themselves have hot mirrors to block wavelengths above 700nm with a gradual cut-off to preserve the red response; and so the cameras' CMOS sensors see a small portion of light at the red edge of the visible spectrum. This includes some IR pollution that shows on the camera output, particularly in areas such as dark manmade fabric with greens becoming a reddish muddy brown and blacks having a magenta hue. These pollution effects are not seen when using a T1 IR filter.

www.tiffen.com

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