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A New Kind of Iris Pull: Cinefade VariND & Vari360
- Author: Sam Jorgensen
cmotion & Cine Visuals Present: Cinefade Vari360 & VariND
Cinematic Heritage
Cinema has always evolved through quiet revolutions. Sometimes those revolutions arrive in the form of a new camera body or a remarkable lens. Other times they appear through smaller innovations that subtly reshape the creative process. The story of cmotion and the Cinefade system belongs to that latter category. It is a story rooted not in spectacle but in the persistent curiosity of engineers and filmmakers who wanted to remove one of the long standing limitations of cinematography. The company cmotion was founded in Austria in 2003 by cinematographer and engineer Christian Steger. From the beginning the company focused on building tools that allowed camera crews to operate with greater freedom and precision. Wireless lens control systems were becoming increasingly important as cameras moved onto cranes, drones, remote heads, and other stabilized rigs. The role of the focus puller was changing rapidly and cmotion set out to build technology that respected the craft while embracing modern production realities. Over time the company became known for highly reliable wireless systems and motors that could communicate seamlessly with the growing ecosystem surrounding ARRI cameras. Within that environment a new idea began to circulate among cinematographers. It was a problem that everyone accepted as unavoidable. Aperture changes always affect exposure. If a cinematographer wanted to change depth of field in the middle of a shot the brightness of the image would inevitably shift. For decades filmmakers simply avoided that move or hid it through lighting tricks or careful editing.
The concept that eventually became Cinefade was developed by filmmaker and inventor Oliver Janesh Christiansen. His vision was deceptively simple. He imagined a system that would allow a cinematographer to open or close the aperture during a shot while the exposure remained perfectly stable. The image could shift from deep focus to shallow focus without any distracting change in brightness. What had once been a technical constraint could suddenly become a storytelling tool. Turning that concept into reality required collaboration. Christiansen partnered with cmotion to develop a synchronized system that linked a motorized variable neutral density filter to the iris control of a cinema lens. As the aperture moved the filter would automatically compensate by adding or removing density. The result was a seamless transformation of depth of field without altering exposure. The system was introduced to the industry as the Cinefade VariND and it immediately captured the imagination of cinematographers who had long dreamed of such control. As development continued the system expanded into the Cinefade Vari360 which added full rotational control of the polarizing elements and advanced sensor technology that could stabilize polarization as the camera rotated. What began as a clever optical trick evolved into a complete creative platform. The Cinefade VariND and Vari360 were no longer simply filters. They were instruments designed to give cinematographers a new language of visual expression.
Creative Compatibility
For many cinematographers, the key component of NDs, polarizers, or any filter is neutrality and image control. The Cinefade system was designed from the beginning to maintain the highest optical fidelity possible. The filters are built with premium polarizing glass developed with ARRI and they are carefully engineered to avoid color shifts or unwanted artifacts. When light passes through the Cinefade system the image retains the clarity and tonal balance expected from modern cinema optics and remains neutral so as to not alter the carefully chosen look from the glass of the lenses. Skin tones remain natural and highlights maintain their smooth rolloff. The filter does not impose a heavy signature or stylized look. Instead it behaves like a neutral extension of the camera system.
What Cinefade adds to the image is not a texture or a flare pattern. It adds motion within depth itself. The ability to gradually move from a world where every plane of focus is sharp to a world where the subject floats against a soft background introduces a powerful narrative gesture. It can shift the emotional perspective of a scene without a single cut. The viewer experiences the change almost subconsciously as the visual language evolves in real time. This capability opens a range of creative possibilities. A conversation that begins in a wide deep focus composition can slowly isolate a character as the depth of field narrows. A moment of realization can be emphasized as the background melts away. In another scene the camera may start with a shallow intimate focus and gradually reveal the surrounding environment as the aperture closes. These transformations feel organic and immersive because they occur within the continuous flow of the shot.
Before Cinefade such transitions were extremely difficult to achieve. Attempting to adjust aperture during a shot would immediately brighten or darken the image. Lighting would need to be adjusted in coordination or the change would need to be hidden through editing. Cinematographers often abandoned the idea altogether because the practical challenges significantly outweighed the benefit. Cinefade quietly removes that obstacle and allows the creative instinct to take precedence. Perhaps the most compelling aspect of Cinefade is how naturally it fits into the cinematographer’s mindset. It does not demand a radical new workflow or impose an artificial aesthetic. It simply unlocks a tool that feels as though it should have existed all along. The camera becomes capable of breathing with the scene in a new and subtle way.
Handling and Adaptability
On a film set elegance is often measured not only by what a tool can achieve but by how easily it integrates into the workflow of the crew. Camera assistants operate in an environment where every second counts and equipment must perform flawlessly under pressure. The design of the Cinefade VariND and Vari360 reflects a deep understanding of that reality. Physically the filters conform to the familiar standards of professional cinema matte boxes. They slide smoothly into the same filter stages that camera assistants already use every day. There is no cumbersome additional rigging or unusual mounting procedure. The system becomes part of the camera package with minimal disruption.
The motorized polarizing element is compact and precisely engineered. Its movement is smooth and controlled which allows for gradual exposure compensation without visible stepping or mechanical noise. Assistants can trust the mechanism to respond immediately to commands from the lens control system. Reliability in this context is essential because the entire purpose of Cinefade is to synchronize perfectly with the aperture adjustments happening on the lens. One of the greatest advantages of the system is its integration with the ARRI Hi-5 and other wireless control systems developed by cmotion. The 1st AC can control the Cinefade parameters remotely with the same familiar interface used for focus, iris, and zoom. The transition between aperture and neutral density compensation happens automatically once the system is calibrated. Calibration itself is straightforward. The system learns the relationship between the lens aperture and the variable neutral density range. Once that relationship is established the filter responds instantly whenever the iris changes. The camera assistant does not need to manually ride the exposure or worry about keeping the image balanced. The technology quietly handles that complexity in the background.
This simplicity solves a practical problem that has existed on set for decades. Shots that required exposure adjustments during movement often forced 1st ACs to juggle multiple controls or rely on lighting changes that could be unpredictable. Cinefade removes that juggling act and replaces it with a coordinated system that behaves like a single instrument. For cinematographers they can know that the exposure will remain consistent even as the depth of field evolves. The ability to manage these changes remotely also proves invaluable when the camera is mounted on a crane, drone, or car rig where physical access is limited. The entire adjustment can be performed from the hand unit without interrupting the flow of the take.
Technical Innovations
Beneath the elegance of the Cinefade concept lies an impressive collection of technical engineering. The filters themselves are built to the industry standard 4×5.6” format which allows them to integrate with most professional matte boxes seamlessly. This familiar size ensures compatibility with widely used systems from ARRI and other manufacturers. The variable neutral density range of the Cinefade system spans roughly five stops of light reduction – from 0.4-1.9+ ND. The range is carefully calibrated to correspond with typical aperture adjustments performed during a shot. When a cinematographer opens the lens by several stops the filter compensates by adding the appropriate amount of density to preserve the exposure level.
At the optical core of the system is a pair of high quality polarizing filters. One element remains fixed while the other rotates through a motorized mechanism. As the angle between the polarizers changes the amount of light passing through them also changes. This principle of cross polarization creates the variable neutral density effect. The rotation is extremely precise which allows the system to produce smooth continuous adjustments rather than abrupt steps. Even at its minimum density the system introduces a small base level of light reduction which is inherent to the physics of polarizing filters. This starting point is a little over one stop of light reduction. From there the motorized element can increase the density up to five stops of light reduction. The transitions can occur rapidly if desired or move gradually for more subtle visual shifts.
The Cinefade Vari360 builds upon this foundation by enabling full rotational control of the polarizing elements. This capability allows cinematographers to manipulate the polarization of reflections and skies during a shot. The filter can rotate through a full circle which introduces creative possibilities beyond exposure control. Reflections on glass water or metallic surfaces can be adjusted dynamically as the camera moves. To support these movements the Vari360 incorporates a three axis gyroscopic sensor that monitors the orientation of the camera. This sensor allows the system to maintain consistent polarization even when the camera tilts or rolls. The result is a stable and predictable optical behavior that preserves the intended effect regardless of camera movement. The mechanical precision of the motor assembly is another key aspect of the design. The movement must be smooth enough to avoid visible artifacts while remaining fast enough to track sudden aperture adjustments. The engineers at cmotion developed a drive mechanism capable of executing the full range of density changes in well under a second if required.
Ecosystem
While the filters themselves are the most visible element of the Cinefade system they represent only one part of a larger network of components that work together to make the effect possible. At the center of this network is the motorized polarizer assembly which houses the rotating filter and the precision drive mechanism responsible for adjusting the density. The motor connects to the camera control ecosystem through the LBUS communication protocol which is widely used across ARRI and cmotion equipment. This connection allows the Cinefade system to exchange data with the wireless lens control units that assistants operate on set. Through this communication the system can respond instantly to iris changes and maintain perfect synchronization between aperture and neutral density compensation. Power is supplied through the same cabling infrastructure used for other lens control motors. This approach keeps the rig clean and avoids introducing additional battery systems or complicated wiring. The Cinefade components simply integrate into the existing network that already powers focus and iris motors.
Control signals originate from the hand units used by the 1st ACs. Devices such as the ARRI Hi-5 provide a familiar interface where parameters can be monitored and adjusted. Once the system is calibrated the 1st AC can initiate cinefade transitions or operate the variable neutral density function directly from the hand unit. Additional accessories support the installation and stability of the filter assembly within the matte box. Precision mounts and brackets ensure that the polarizing elements remain perfectly aligned with the optical path of the lens. This alignment is crucial because even slight misplacement could introduce unwanted optical effects. Together these components create a unified system that feels natural within the modern cinema camera ecosystem. The motors cables control units and filters communicate seamlessly so that the cinematographer experiences only the creative result rather than the technical complexity behind it.
The Cinefade VariND and Vari360 are available for rent at Cine Visuals. For inquiries or testing appointments email info@cinevisuals.com or call (323) 244-2552.