Square camera filter in 4×4 inch (100×100 mm) format for insertion into a matte box.
The term "4x4 filter" refers to a square accessory filter for film and video cameras in the 4x4 inch format (colloquially "four-by-four"). Such filters are not screwed onto the lens thread but are inserted into the filter stage of a matte box in front of the lens. Unlike round screw-in filters, square filters can thus be used independently of lens diameter, combined in stacks, and (for non-rotationally symmetrical filters like graduated or polarizers) freely positioned.
Besides the wider 4x5.65 inch format, this format is one of the two common matte box filter sizes. The square 4x4 format is more compact and lighter, but with very wide-angle lenses, it may cover the image field less generously than the rectangular 4x5.65 format, which is particularly preferred for anamorphic and super-wide optics.
The following data refers to the standard 4x4 cine format of common manufacturers (including NiSi, Schneider Optics, Formatt-Hitech, Tiffen):
| Feature | Specification |
|---|---|
| Nominal Size | 4 x 4 inches (approx. 100 x 100 mm) |
| Geometry | Square |
| Material | Optical glass (for some effect filters, also resin/plastic) |
| Thickness (Standard) | Approx. 4 mm |
| Thickness (Slim Variants) | Approx. 2 mm |
The format is available in the filter types commonly used on set, including:
4x4 filters are placed into the filter stage of a matte box. The narrower slim versions fit into matte boxes with ARRI-compatible standard trays, while thicker filters require appropriately dimensioned filter frames. As the format also fits into many classic filter holders for square filters (e.g., Cokin Z, Lee, Formatt-Hitech), it is also common in the DSLR/mirrorless segment.
When stacking multiple filters (e.g., ND plus diffusion plus polarizer), care must be taken to ensure clean, grease-free surfaces and to avoid potential reflections between the glass surfaces. With very wide-angle lenses, it should be checked before shooting whether the square 4x4 format fully covers the image field or if a switch to the wider 4x5.65 format is necessary.
As a cinematographer, 4x4 filters are indispensable tools for precise light control and image shaping for me. Especially in challenging lighting conditions, they allow me to achieve the desired visual aesthetic without relying on expensive post-production corrections. The quality of the filters and their correct application significantly determine the final image quality.
For me as a director, 4x4 filters are important creative tools to deliberately shape the film's visual language and enhance emotional moods. Collaborating with the cinematographer on filter selection is essential to implement the desired cinematic vision already during the shoot. Filters help me ensure continuous visual consistency across different shooting days and locations.
From a producer's perspective, high-quality 4x4 filters represent a worthwhile investment that saves time and money in post-production. While acquiring a complete filter set requires a significant initial outlay, it pays for itself through flexibility on set and the reduction of complex digital corrections. Furthermore, professional filters minimize the risk of costly reshoots due to image quality issues.
1. Was beschreibt „4x4 Filter" am besten?
2. Zu welchem Department gehört „4x4 Filter"?
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