Studio : Schneider Optics, Inc. USA

Publisher : Schneider Optics, Inc. USA

Binding : Electronics

Product Description
The Schneider 4 x 4" True-Cut 680 IR Filter is an infrared control filter that is designed for digital cinematography. While recording video with a CCD or CMOS camera, multi-stop neutral-density filters are used to maintain proper exposure by compensating for increased light levels when widening the camera lens's iris to obtain a narrower depth of field. As the increased amount of light passes through multi-stop neutral-density filtration, visible light is progressively blocked, while infrared light is allowed to pass through. As the proportion of infrared light that reaches the sensor of a digital cinematography camera becomes greater, the results can show unwanted color shifts, particularly in dark areas of the frame such as shadows where the appearance of black is dominant. When the Schneider 4 x 4" True-Cut 680 IR Filter is used along with multi-stop neutral-density filters while recording with a digital sensor, it blocks 50% of visible light waves at 680 nanometers. At 700 nanometers, 90% of infrared light waves are blocked, after which they are progressively eliminated. This helps to limit the light that falls on the sensor to the visible spectrum, preserving color accuracy throughout the frame as potential infrared color shifts are prevented or minimized. A similar True-Cut 750 IR filter moves the point at which 50% of light is blocked into the infrared spectrum to 750 nanometers. While that is sufficient for many cameras, others may have sensors that require a higher degree of infrared control, such as that provided by a Schneider True-Cut 680 IR Filter.
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