Tiffen 5.65 x 5.65" White Water Glass Full Spectrum IRND 2.1 (7-Stop) Filter

With the advent of Digital Motion Picture Cameras and a digital imaging device taking the place of film, DOPs no longer have the option of selecting the optimum film for their application. They must now deal with a "one size fits all" imaging device that is designed to replace all the various film types; what you see is what you get.

This means that the use of filters regardless of the capture format rate is even more critical in achieving the desired results. Because the imaging device is designed to be sensitive in low light conditions, it is easily over exposed in bright situations. The Neutral Density filter is used to control light as well as to gain more control over depth of field.

Up to now ND filters made with dyes did this job, but passed small amounts of far red to near infra-red light to create their transitional slope between attenuating visual and passing infra-red.

In addition to the visual spectrum, digital imaging devices are sensitive to infra-red. This infra-red can have an effect on the quality and the color of the image. Digital imaging devices require higher grade neutral density filters but are sensitive to infra-red (IR).

This IR pollution has an adverse effect on the quality and the color rendition of the images - stealing contrast and color, resulting in unwanted color shifts. Greens become a reddish muddy brown and blacks have a magenta hue. In addition, infrared has a different focal length than visible light: therefore, your images may also appear out of focus.

To combat this problem, some camera manufacturers use an IRblocking filter in front of the device - most notably, the Sony F and EX Series, ARRI Alexa and the Panavision Genesis. However, when you combine a neutral density filter with cameras containing a built in IR blocking filter, the result is a spike in the far red and near infra-red.

For this purpose, Tiffen pioneered the Full Spectrum IR ND Filters designed to provide a true neutral density into the IR spectrum to correct this issue. Tiffen's Full Spectrum IR ND Filters now allow for the use of heavier grades of Neutral Density filters needed for these hi-definition cameras while, at the same time, maintaining color balance.

The Tiffen Full Spectrum IR ND filters extend the light transmission characteristics into the infrared region of the spectrum and are essential for the cinematographer using the Sony F and EX Series, ARRI Alexa or Panavision Genesis to control far red and near infra-red, particularly when using heavier densities.

Tiffen Full Spectrum IR ND Filters can be used in conjunction with the Tiffen Clear Hot Mirror for Digital Motion Picture Cameras using a CMOS chip sensor which does not use an internal IR Blocking filter such as the RED ONE and SI2K, to fully combat near and far IR pollution across the range.

Tiffen Full Spectrum IR NDs are also manufactured in combination with the Tiffen Hot Mirror for ease of use in sunshades or smaller Matte Boxes when using these cameras. Both series are available in ND.3, ND.6, ND.9, ND1.2, ND1.5, ND1.8 and ND2.1.

These filters are manufactured using Tiffen's proprietary lamination process, which means that each effect is captured between two pieces of glass, allowing Tiffen to grind and polish both surfaces to achieve perfect parallelism. For the cinematographer, this means worry free handling.

These filters are made with Water White glass and are available in sizes 4x4, 4x5.650, 5.65x5.65, 6.6x6.6, 95C, 41/2, 138mm, 105C, 72, 77, 82mm wide angle and Series 9.