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Model 666685BN9. 6.6x6.6" (6x6") size for use with matte box. Retails originally for over $350/each.

The 6.6 x 6.6" Tiffen Combination 85B/ND Filter blends both an amber color conversion 85B and a 0.9 neutral density filter. The ND filtration provides a 3-stop exposure reduction for darkening the entire image in order to photograph with a wider aperture or slower shutter speed than normally required. The 85B filtration covers the entire filter plane and converts the color temperature to 3200K for use with type B (tungsten) films.

This filter is made using ColorCore technology, a process that involves laminating the filter substrate between two pieces of optical glass, and grinding flat to a tolerance of 1/10,000th of an inch. This filter measures 6.6 x 6.6" / 167.6 x 167.6mm.

• Combination of both an amber color conversion 85B and a neutral density filter.
• 0.9 ND filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.
• 85B filter converts the color temperature to 3200K, allowing you to use type B tungsten-balanced film in daylight situations.