Blackmagic Design Spares - Camera PCC4K - Glass Filter
The Blackmagic Design Spares – Camera PCC4K – Glass Filter is the essential Optical Low Pass Filter (OLPF) and IR Cut Filter assembly located in front of the 4/3" sensor. This high-precision glass component acts as the final protective barrier, ensuring image fidelity by managing light wavelengths before they reach the sensor silicon.
Core Functional Benefits
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Infrared (IR) Filtration: The glass features a specialized dichroic coating that blocks infrared light. This prevents "IR pollution," ensuring that black fabrics remain deep black rather than shifting to reddish or purple hues.
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Moire and Aliasing Reduction: As a high-quality OLPF, it microscopically softens extreme fine-detail patterns. This prevents the "rainbow" interference effects often seen when filming tight textures, bricks, or digital screens.
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Sensor Shielding: The filter serves as a physical shield. Most "sensor scratches" are actually surface damage to this replaceable glass, allowing for cost-effective repairs without replacing the entire sensor module.
Common Replacement Scenarios
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Coating Delamination: Over time, or due to aggressive cleaning agents, the IR coating may peel or flake, resulting in visible artifacts or "discolored patches" in the corners of the frame.
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Surface Scratches: Physical abrasions caused by improper cleaning tools or airborne debris entering the Micro Four Thirds (MFT) mount.
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Glass Etching: In high-humidity environments, moisture can lead to fungus growth that etches the glass surface, creating permanent "haziness" in the footage.
Technical Installation Guidelines
Repair Difficulty: Advanced.
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Clean-Room Standards: Replacement must occur in a dust-free environment. Any particulates trapped between the glass and the sensor will be permanently visible in every recording.
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Precision Alignment: The glass must be seated perfectly level within its rubber gasket. Even a microscopic tilt can cause a "soft" focus side on the horizontal plane of your image.
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Optical Calibration: Replacing the internal glass can occasionally shift the flange focal distance. It is recommended to check "infinity focus" on your lenses after installation to see if additional shimming is required.
Diagnostic Comparison
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Cleaning Required: If you see soft, blurred spots that change size as you adjust the lens aperture (f-stop), the filter likely only needs a professional sensor swab.
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Replacement Required: If you see sharp, defined lines, "pits," or discolored flakes that remain constant regardless of lens choice or aperture, the glass filter has sustained permanent physical damage.
Professional Maintenance Tip
To verify the integrity of your PCC4K Glass Filter, shine a bright LED light into the lens mount at a 45-degree angle. This "glancing light" technique reveals surface micro-scratches and coating failures that are often invisible during standard front-on inspections.
