A term from cinematography and camera work.
Definition
A 6.6x6.6 filter refers to a square camera filter with dimensions of 6.6 x 6.6 inches (approximately 167 x 167 mm). This filter size is among the professional standard formats in cinematography and is primarily used in high-end productions with larger camera systems. The filter is mounted in special filter holders (matte box) in front of the lens and influences the incoming light according to its specific properties.
The 6.6x6.6 size allows for use with lenses featuring large front elements and wide-angle focal lengths without causing vignetting (edge shading). Available filter types include Neutral Density filters (ND filters), polarizing filters, color correction filters, graduated filters, and special effect filters.
Practical Application
In the professional film industry, 6.6x6.6 filters are primarily used with cinema cameras such as ARRI ALEXA, RED systems, or Sony VENICE. They are particularly important for exposure control in exterior shots, color temperature adjustments, and creative image design. The larger filter surface compared to smaller formats offers more uniform light distribution and reduces optical artifacts.
Technical Details
The filters are usually made of optical glass or high-quality plastics and are supplied in precision mounts. Professional manufacturers such as Tiffen, Schneider-Kreuznach, or Lee Filters offer extensive 6.6x6.6 ranges with different density levels and coatings.