Viofo CPL-100 Filter: Fixing Dash Cam Windscreen Glare

What the CPL-100 is for

If your footage looks washed out, with dashboard shapes or bright sky reflected across the glass, the problem is usually glare and reflection reaching the lens. A circular polarising filter is designed to reduce those reflections and restore contrast. The Viofo CPL-100 is a circular polarised filter made for the front camera of specific Viofo dash cam models, and it also covers the lens against fingerprints, scratches and dirt.

It is a physical filter, not a software fix. It changes what light reaches the sensor, so the improvement happens in the recorded file rather than in editing.

Symptoms a CPL filter can address

• Washed-out colour in strong light: The CPL-100 is designed to keep colours saturated and maintain contrast when bright light would otherwise flatten the image.
• Reflections from the windscreen and dashboard: The filter is designed to remove reflections from surfaces such as glass, water, paint, sky and the vehicle's dashboard.
• Glare from shiny surfaces ahead: The CPL-100 reduces glare from glass, metals and other shiny surfaces that would otherwise damage image quality.
• Lens wear from daily use: The filter acts as a shield against fingerprints, scratches and dirt reaching the camera lens.

Check your model before you buy

The CPL-100 is not a universal filter. The supplied compatibility information lists the front camera of the A119v2, A119v3, A119 Mini, A119 Mini 2, A129, A129 Plus, A129 Pro and A129 Rear cameras. If your dash cam is a different model, or you want to filter a rear camera other than the A129 Rear, the supplied information does not confirm a fit, so treat this filter as unverified for your setup rather than assuming it will work.

Compatibility and fit evidence

• Viofo CPL-100 Circular Polariser Filter Anti Glare for A119 Mini A129 Dash Cams: CPL-100 filter for the front camera of all A119v2, v3, A119 Mini, Mini 2, A129, A129 Plus, A129 Pro and A129 Rear cameras. This is the list to match against your own dash cam model before ordering.

  

• Viofo CPL-100 Circular Polariser Filter Anti Glare for A119 Mini A129 Dash Cams: The CPL filter is compatible with the CPL-100 Filter for A119V2, A119V3, A119MINI2, A129 Duo, A129 Pro Duo and A129 Plus Duo. Duo kit owners can check the front camera against this second compatibility list.

What to expect in the footage

The supplied information describes a contrasted image with vivid colours in bright daylight, and says the filter can be used during the daytime and at night. It does not provide measured glare-reduction figures, so treat the improvement as a visual one you judge from your own recordings rather than a guaranteed percentage.

Polarising filters work by managing reflected light, so the effect depends on the angle of the glass and the light. The supplied information does not describe a specific adjustment procedure beyond fitting the filter, so do not expect a documented tuning process.

Fitting the CPL-100

1. Match the model: Confirm your dash cam appears in the supplied compatibility list for the front camera.
2. Choose a slot and keep it upward: The supplied installation note says you can randomly choose one slot and keep it upward, then put the CPL on the lens in that direction.
3. Seat it on the lens: The filter is described as easy to install and remove, so it can be taken off when you do not need it.
4. Review a test clip: Record in bright conditions and compare reflections and colour against footage without the filter. The supplied information does not give a test duration or a required lighting setup.

Care and trade-offs

The CPL-100 has a multi-resistant coating and is described as scratch resistant, dust resistant and easy to clean. That makes it a practical sacrificial layer over the dash cam lens, but it is still an added piece of glass in front of the sensor.

The supplied information does not state how the filter affects exposure settings, whether it must be removed for any mode, or how it performs in specific low-light conditions beyond the claim that it can be used at night. If those details matter to your setup, they are not confirmed here. The catalog price is USD 14.76 against a comparison price of USD 19.95, so the cost of trying it is modest relative to the camera it protects.

Product facts

• Viofo CPL-100 Circular Polariser Filter Anti Glare for A119 Mini A129 Dash Cams: VIOFO CPL Circular Polarised Filter CPL-100, scratch resistant, dust resistant and easy to clean. Confirms the coating and cleaning claims without implying more than the supplied record states.
• Viofo CPL-100 Circular Polariser Filter Anti Glare for A119 Mini A129 Dash Cams: Reduces reflections and glare from glass, metals and shiny surfaces, and helps make colours more saturated. These are the two outcomes to judge in your own before-and-after clips.