Eyedirect Interview Rig

The Mechanics of the EyeDirect Interview Rig

The Eyedirect Interview Rig is a specialized optical tool designed to facilitate direct eye contact between a subject and an interviewer while the subject looks directly into the camera lens. Unlike a standard teleprompter which displays text, this device uses a patented folding mirror system to "project" the interviewer’s face onto a beam-splitter glass positioned in front of the lens. This allows non-professional subjects—such as documentary participants or corporate executives—to maintain a natural, conversational gaze with a human being rather than staring into a glass element. Within the manufacturer's lineup, the EyeDirect Mark II serves as the professional standard for "interrotron-style" setups, sitting above basic tablet-based prompters due to its dual-mirror versatility. It is engineered for high-end documentary production, broadcast journalism, and high-stakes corporate communications where the psychological comfort of the subject is paramount to the quality of the performance.

The device operates on a purely mechanical and optical basis, requiring no external power or electronic components to function in its primary "interview" mode. The system consists of a large primary housing that contains a 50/50 beam-splitter glass, a secondary "wing" mirror that captures the interviewer’s reflection, and a mounting system that integrates with professional cinema cameras. By adjusting the angle of the wing mirror, the interviewer can sit to the side of the camera, or even behind it, and still appear directly in the subject's line of sight. This physical redirection of the line of sight is achieved without any electronic latency, ensuring that the subtle cues of human conversation—nodding, smiling, and eye movement—are synchronized perfectly for the subject.

Optical Integrity and Light Transmission

The core of the Eyedirect Interview Rig is its high-grade 50/50 beam-splitter glass. This specific ratio means that 50% of the light entering the front of the rig passes through to the camera sensor, while 50% is reflected to the subject. In practical terms, this results in a light loss of approximately one stop. Cinematographers must account for this by increasing their lighting intensity or opening the lens aperture by one full stop to maintain the desired exposure on the sensor. The glass is manufactured to minimize chromatic aberration and ghosting, ensuring that the image captured by the camera remains sharp and color-accurate despite passing through an additional optical element. Because the glass is positioned at a precise 45-degree angle within the housing, it is essential that the camera lens is centered perfectly to avoid edge distortion or internal reflections.

The "wing" mirror is a secondary high-reflectivity surface that can be positioned on either the left or right side of the main housing. This mirror is adjustable on a multi-axis pivot, allowing the interviewer to find a comfortable seating position regardless of the height of the camera or the constraints of the room. The interior of the main housing is treated with a matte black, non-reflective coating to prevent stray light from bouncing back into the lens. This is particularly important when shooting in high-contrast environments or when using bright key lights, as any internal flare would immediately degrade the contrast of the recorded image. The rig also includes a set of "donuts" or fabric bellows that seal the space between the rear of the rig and the front of the lens, preventing light leaks from behind the camera that could cause "veiling glare" on the beam-splitter glass.

Build Quality, Mounting, and Physical Handling

The Eyedirect Interview Rig is built around a heavy-duty 15mm LWS (Light Weight Support) rod system. The entire assembly is mounted on a baseplate that provides 15mm rod passes, allowing it to be integrated into standard cinema rigs. The primary housing is constructed from high-impact polycarbonate and aluminum, balancing the need for structural rigidity with the requirement to keep the total weight manageable for tripod heads. The rig typically weighs approximately 4.5kg (10 lbs) without the camera, which means it requires a tripod with a significant payload capacity—usually a 75mm or 100mm bowl fluid head capable of supporting at least 12-15kg once the camera, lens, and battery are added.

Handling the rig on set requires a specific sequence of adjustments. First, the camera is mounted to the rear of the 15mm rods using the included riser blocks. These blocks allow for vertical adjustment to ensure the lens is centered in the 160mm opening of the rig. The rig itself can be slid forward or backward on the rods to accommodate different lens lengths. Once the camera is positioned, the interviewer adjusts the wing mirror until they can see the subject's eyes, and the subject confirms they can see the interviewer's face clearly. The rig features oversized, textured knobs for all adjustments, which can be tightened by hand without the need for Allen keys or specialized tools. This is critical for fast-paced shoots where the height of the interviewer or the subject may change between setups.

Video Capability and Lens Compatibility

While the Eyedirect Interview Rig does not have an internal sensor or recording capability, its physical design imposes specific constraints on the camera's video output. The most significant limitation is the focal length of the lens used. Because the subject is looking through a "tunnel" created by the housing, using wide-angle lenses can result in vignetting (the edges of the rig appearing in the frame). On a Full Frame sensor, lenses wider than 35mm will typically show the internal edges of the rig. For Super 35mm sensors, the safe limit is generally around 24mm or 25mm. The rig is most effective when used with "portrait" focal lengths—typically between 50mm and 85mm—which provide a flattering perspective for interviews and allow the rig to be placed at a comfortable distance (3 to 6 feet) from the subject.

The rig is also compatible with "Prompter Mode." By removing the wing mirror and placing a tablet (such as an iPad) in the accessory tray, the device functions as a standard teleprompter. This dual-purpose capability makes it a versatile tool for productions that need to switch between scripted addresses and unscripted interviews. When used in prompter mode, the 50/50 glass ensures the text is bright and legible for the subject while remaining completely invisible to the camera sensor. The rig does not interfere with the camera's autofocus systems, though users should ensure that the beam-splitter glass is kept meticulously clean, as dust or smudges can cause some phase-detection AF systems to hunt, particularly in low-light conditions.

On the Shoot: Real-World Indian Production Scenarios

In a corporate studio session in Mumbai’s BKC district, the Eyedirect Interview Rig is frequently used for "Message from the CEO" videos. In these high-pressure environments, the executive often has less than 30 minutes to deliver a complex address. By using the rig, the director can sit right next to the camera and maintain a reassuring presence. The CEO looks into the lens but sees the director's face, leading to a more relaxed posture and a natural vocal cadence that is often lost when staring at a blank lens or a scrolling prompter. The rig’s ability to quickly switch to a tablet-based prompter allows the crew to capture the scripted portion of the speech and then immediately transition into a Q&A "fireside chat" style interview without moving the camera or changing the lighting setup.

During a documentary shoot in the narrow lanes of Old Delhi or a bustling market in Bengaluru, the rig proves its value with non-professional subjects. When interviewing a local artisan or a tech founder who is not used to being on camera, the "black hole" of a large cinema lens can be intimidating, causing the subject to look away or become stiff. The Eyedirect Interview Rig removes this barrier. Because the subject is looking at the interviewer, they often forget the camera is there entirely. In these scenarios, the rig’s 15mm rod mounting is essential, as it allows the entire setup to be moved as a single unit on a heavy-duty rolling stand or a sturdy tripod, though the bulk of the rig means it is rarely used in "run-and-gun" handheld situations.

For a lifestyle or travel production in Goa, the rig is used to capture "direct-to-camera" hosting segments where the host needs to interact with a producer who is off-camera. In the bright, high-contrast light of a coastal shoot, the rig’s internal baffles and the included fabric hood are vital for maintaining image contrast. The producer can stand in the shade of a flag or umbrella, and their face will still be reflected clearly to the host. This setup is particularly effective for "explainer" content where the host needs to maintain a high level of energy and engagement with the audience, which is much easier to achieve when they are receiving visual feedback from a real person.

Compatibility and Essential Pairings

The Eyedirect Interview Rig is designed to be camera-agnostic, meaning it works with everything from small mirrorless cameras like the Sony A7S III to large cinema bodies like the ARRI ALEXA 35 or RED V-RAPTOR. However, compatibility is dictated by the mounting hardware. It requires a baseplate with 15mm LWS rod ports. If using a camera with a high optical axis (the distance from the bottom of the camera to the center of the lens), the included riser blocks are necessary to align the lens with the rig's center. The rig's rear opening is large enough to accommodate professional cinema zooms and primes with front diameters up to 114mm, and the included "donut" set ensures a light-tight seal for smaller lenses like the Canon L-series or Sigma Art primes.

Essential pairings for this rig include:

• Heavy-Duty Tripod: A fluid head with a minimum 10kg payload capacity and adjustable counterbalance is required to handle the front-heavy nature of the rig.
• 15mm Rods: While the rig often comes with a set, longer rods (300mm or more) are frequently needed to provide enough "runway" for long lenses and battery plates.
• Tablet/iPad: For use in prompter mode, a tablet with a dedicated prompting app is required. The tray fits standard 9.7-inch and 11-inch tablets comfortably.
• Cleaning Kit: Because the subject and the camera both look through the beam-splitter, a high-quality microfiber cloth and optical cleaning fluid are mandatory to remove fingerprints or dust.

Limitations and Alternative Choices

The Eyedirect Interview Rig is not a universal solution for every interview. Its primary limitation is its physical size and weight. It significantly increases the footprint of the camera, making it difficult to use in small rooms or tight corners. Because it adds a layer of glass in front of the lens, it is not suitable for shoots where absolute maximum wide-open sharpness is required, or where the one-stop light loss cannot be compensated for. Furthermore, the rig is strictly for stationary interviews; it is too cumbersome for gimbal use and nearly impossible to balance on a shoulder rig for handheld work.

For productions that require a wider field of view (wider than 24mm on S35), a traditional side-address interview—where the subject looks off-camera at the interviewer—is a better choice. If the goal is purely to read a script and eye contact with a human is not required, a standard, lightweight tablet prompter is more portable and faster to set up. Additionally, for "run-and-gun" documentaries where the crew must move quickly between locations, the 10-15 minute setup time of the EyeDirect may be a hindrance. In those cases, a simple "eye-line" light or a small monitor mounted near the lens might be a more practical, albeit less effective, compromise.