Optical in-camera effects occupy an awkward middle ground in modern production. Diopters and prisms can produce striking looks, but they are often unpredictable from setup to setup, and repeating an effect precisely across takes or coverage angles is genuinely difficult.
The alternative — building the effect in post — means the DP is composing blind, trusting that two separately shot angles will marry convincingly once a compositor gets to them weeks later.
The Éclat Stemirax, now part of the Camalot rental inventory, is built to close that gap: a mirror-based lens adapter that superimposes two angles of view optically and in real time, directly in camera, so the composite is visible, adjustable, and reproducible on the day rather than assembled after the fact.
How the Mirror System Works
The Stemirax mounts in front of the lens and uses a stereoscopy-inspired mirror system to combine two angles of view into a single frame.
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360-Degree Rotation: The rig rotates smoothly from horizontal to vertical orientation.
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Dual Modes: The two mirrors can either converge on a single point or be set to run independently in an asymmetric mode, opening up a wider range of compositions than a fixed-convergence system would allow.
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Indexed Mechanics: Settings dialled in during rehearsal can be returned to reliably for the next take or setup — a major advantage over conventional prism systems.
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Remote Motorization: For productions that want remote adjustment during a take, the system supports optional motorization via a wireless follow focus unit, keeping the control method consistent with standard set workflows.
Built to Cinema Standards: Handling & Accessories
The unit is engineered specifically to cinema standards rather than adapted from a still-photography accessory, ensuring it withstands daily rigging and de-rigging on a working set.
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Drawer-Mounted Mirrors: Mirrors can be swapped out quickly without tools.
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96%+ Reflectivity: Each mirror offers over 96% reflectivity, minimizing light loss when combining two optical paths into one image.
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Integrated Filtration: Includes two 4×5.6″ filter trays, allowing filtration to be applied to the combined image without needing to stage a separate matte box in front of the rig.
Where the Stemirax Fits on Set
Because the effect is resolved optically rather than in post, the Stemirax suits productions where the director and DP want to judge a composite look against the actual performance, set dressing, and lighting, rather than approximating it on the day and hoping it holds together in the edit.
This tool is ideal for:
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Narrative Features & Drama
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High-End Commercials
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Music Videos
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Documentary Work
The practical value lies in removing the gap between what is shot and what the finished frame will look like — the DP sees the result live on the monitor and can adjust before calling the take.
Considerations Before Booking
The Stemirax is a specialized tool engineered to perform one specific job with precise mechanical repeatability.
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Occasional vs. Recurring Effects: Productions needing only an occasional flare or one-off trick may find simpler accessories sufficient. However, projects built around a recurring dual-perspective, mirrored, or overlay look will get immense value out of the indexing and reproducibility offered across multi-day shoots.
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Preparation & Crew Time: Camera assistants should budget rehearsal time to log mirror positions, much like focus marks, as the true strength of the system lies in optical precision.
Ready to elevate your in-camera VFX?
Full specifications, kit contents, and current rental availability for the Éclat Stemirax are listed on our webshop.
