70mai CPL Filter vs No Filter: Night Driving Test
By 70mai Official Store | Innovative Dash Cams and Accessories ... | Published: 2026-10-17
Category: Comparisons
We compare dash cam footage with and without a 70mai CPL filter during night driving. See how glare reduction and clarity change, and whether a filter is right for your setup.
Quick answer
A 70mai CPL filter reduces windshield reflections and harsh glare from oncoming headlights and streetlights, which can improve nighttime footage clarity. However, it also cuts some light reaching the sensor, so in very dark conditions without street lighting, footage may appear slightly dimmer than without a filter.
How a CPL filter changes night footage
A circular polarizing lens (CPL) filter works by blocking specific light angles that cause glare and reflections. During the day, this makes the road ahead clearer and colors more vivid. At night, the same principle applies: reflections from your dashboard or windshield are reduced, and the harsh bloom from headlights is softened. The tradeoff is that the filter also blocks some usable light, which can make darker areas of the scene less visible. In well-lit urban streets or highways with consistent lighting, the clarity gain usually outweighs the slight dimness. On unlit rural roads, the loss of light may be more noticeable.
When a CPL filter helps most at night
If you frequently drive on roads with oncoming traffic, streetlights, or wet reflective surfaces, a CPL filter can significantly cut the blinding glare that washes out license plates and road details. The 70mai CPL filters are designed to reduce surface reflections on your windshield or intense sun, and this benefit carries into nighttime conditions. For example, the 70mai CPL Filter for Dash Cam A810/ A810S (product ID 1307015) and the 70mai CPL Filter for Dash Cam 4K Omni (product ID 1307014) both offer enhanced color saturation and lens protection, which can help maintain detail in mixed lighting.
When to skip the filter at night
If your parking area or regular route has very dim ambient lighting—such as country roads with no streetlights—the light loss from a CPL filter may make your footage darker than you'd like. In these conditions, running without a filter lets your dash cam's sensor capture every available photon. Also, if your windshield has a tinting film, the filter may interact unpredictably and reduce image quality. Both 70mai CPL filter product pages note that tinting film can impact functionality, so check your windshield before buying.
Tradeoffs at a glance
- Glare reduction vs light loss: A CPL filter cuts reflections and headlight bloom but reduces total light reaching the sensor. In moderate to well-lit night scenes, the clarity gain wins. In very dark scenes, you may lose shadow detail. If most of your night driving is on lit roads, a filter is a net positive.
- Image clarity vs convenience: With a filter, you get more consistent exposure and less washout from oncoming lights. Without a filter, you avoid any potential dimness and don't have to worry about filter compatibility with windshield tint. Test your typical route with and without the filter to see which gives you the best usable footage.
- Lens protection vs added bulk: CPL filters also shield the dash cam lens from scratches, dirt, and fingerprints. The tradeoff is a slightly larger front profile and one extra step when cleaning the lens. If you park in dusty areas or frequently touch the lens, the protection is worthwhile.
Product facts
- 70mai CPL Filter for Dash Cam A810/ A810S: Reduce surface reflections on your windshield or intense sun: making it easier to see the road ahead. Enhanced color saturation: for more vivid and accurate colors in your footage. This means the filter actively cuts the glare that can hide important details like license plates or road signs, both day and night.
- 70mai CPL Filter for Dash Cam 4K Omni: Reduce surface reflections on your windshield or intense sun: making it easier to see the road ahead. Enhanced color saturation: for more vivid and accurate colors in your footage. Protect your lens from fingerprint, scratch, and dirt: for clearer and more durable footage. In addition to glare reduction, this filter adds physical lens protection, which is useful if you frequently remove and reattach the dash cam.
Which setup fits your night driving?
Best for
- Drivers who regularly encounter oncoming headlights, streetlights, or wet roads at night
- Users who want to reduce dashboard reflections and improve license plate readability in mixed lighting
Not ideal for
- Drivers who spend most of their time on unlit rural roads where every bit of light matters
- Vehicles with heavy windshield tinting film that may interfere with the polarizing effect
