Unboxing 70mai CPL Polarizing Filter
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70mai CPL Polarizing Filter – A Small Upgrade That Makes a Big Difference for the 70mai 4K A800SE
When using a dash camera every day, image clarity quickly becomes one of the most important aspects. My 70mai 4K A800SE dash cam already delivers excellent video quality, but like any camera mounted behind a windshield, it inevitably faces certain optical challenges: reflections from the dashboard, harsh sunlight, and glare that can reduce detail in recorded footage. To address these issues, I decided to test the 70mai CPL (Circular Polarizing Lens) Filter, a small accessory designed specifically to enhance dashcam image quality. After installing and using it for some time, I can confidently say that this simple add-on noticeably improves the overall recording performance of the camera.
Design and Build Quality
The 70mai CPL Filter is compact, lightweight, and very well constructed. The filter ring is made from durable material with a finely textured edge that allows for easy rotation and adjustment. The build quality feels solid and premium despite its small size. The filter itself attaches directly to the lens of the dash cam. In my case, I mounted it on the 70mai 4K A800SE, but it is also compatible with several other models including 70mai Lite 2, Pro, A500S, A510 and A800S. Installation is extremely straightforward — it simply snaps or fits over the camera lens and stays firmly in place. One detail I appreciated is the rotating outer ring. This allows the polarization angle to be adjusted while watching the live preview on the dashcam screen. By slowly rotating the filter, it becomes easy to find the optimal position where reflections disappear and the image becomes clearer.
Installation and Adjustment
Installing the CPL filter takes only a few seconds. After attaching it to the dashcam lens, I powered on the camera and adjusted the filter while looking at the preview display.
The process is simple:
– Mount the filter onto the dashcam lens.
– Turn on the camera.
– Slowly rotate the outer ring of the CPL filter.
– Stop when reflections and glare are minimized.
Because polarization depends on the angle of light entering the lens, this adjustment step is important. Once properly aligned, the improvement becomes immediately visible.
Real-World Image Improvements
The main purpose of a CPL filter is to reduce polarized light, which typically appears as glare or reflections. In the case of dashcams, the most common problems are:
– Reflections from the dashboard
– Strong sunlight hitting the windshield
– Washed-out colors in bright conditions
After installing the CPL filter on my A800SE, the improvements were noticeable in several ways. First, dashboard reflections were significantly reduced. Without a CPL filter, bright daylight often causes parts of the dashboard to reflect on the windshield, which then appears in the recorded footage. With the filter properly adjusted, these reflections almost completely disappear. Second, glare from sunlight is minimized. Driving toward the sun often creates strong highlights that reduce overall scene visibility. The CPL filter helps manage these highlights, making the image more balanced and easier to interpret. Third, colors appear richer and more natural. Polarizing filters increase color saturation by filtering scattered light. As a result, the sky appears deeper, greenery looks more vibrant, and road details become more distinct. Most importantly for a dashcam, license plates and road signs become easier to read, especially under bright lighting conditions.
Additional Lens Protection
Besides improving image quality, the CPL filter also serves another practical purpose: lens protection.
The filter acts as a barrier between the environment and the dashcam lens. This helps prevent:
– Fingerprints
– Dust accumulation
– Minor scratches
– Dirt buildup
Instead of cleaning the camera lens directly, I can simply wipe the filter when needed. This extra layer of protection is particularly useful for dashcams that remain installed in vehicles year-round.
Impact on Brightness
One expected side effect of any polarizing filter is a slight reduction in brightness. Because the filter blocks certain light waves, the image becomes marginally darker. However, with the 70mai A800SE’s sensor and exposure system, this is hardly noticeable during normal daytime driving. The camera automatically compensates for the reduced light, and the overall footage remains bright and well balanced. At night, the impact is minimal, and the advantages during daytime driving more than justify using the filter continuously.
Overall Experience
After using the 70mai CPL Polarizing Filter with my 70mai 4K A800SE, I consider it one of the most useful accessories available for this dashcam. It is simple, affordable, and extremely effective. The improvements in image clarity, reflection control, and color accuracy are immediately visible in real-world driving conditions. For anyone using a dashcam behind a windshield, a CPL filter is not just an optional accessory — it is a practical optical upgrade that helps the camera perform closer to its full potential.
Final Verdict
The 70mai CPL Filter may be small, but it delivers meaningful improvements where it matters most: image quality. By reducing windshield reflections, minimizing glare, and enhancing color contrast, it allows the 70mai A800SE to capture cleaner, clearer, and more reliable footage. Combined with the added benefit of protecting the camera lens, it becomes a simple yet valuable upgrade for any compatible 70mai dashcam. For drivers who rely on their dashcam for safety and documentation, the CPL filter is an accessory well worth adding to the setup.
What’s in the box
1 x 70mai UP06 Hardwire Control Module with Hardwire Power Cable with USB-C Connector
1 x Packaging Box
Photo gallery full album here. Official page here. Read more about 70mai products here.
About 70mai. Founded in 2016, 70mai is an industry-leading auto intelligence company, with specialization in dashboard cameras. To date, it has built a global market presence, selling 2 million dash cams in a single year to 100+ countries spanning Europe, Southeast Asia, North America,and Asia-Pacific. With the vision of delivering a safe, comfortable, and networked experience both on and off the road, 70mai is dedicated to leading smart innovations that make your every journey easier. Our high-quality products, combine advanced technology with sleek design, empower drivers with real-time assistance and peace of mind on the road. Explore more in the video below to see how we’re driving the future of intelligent automotive technology. 70mai has developed an extensive line of auto intelligence products. Our dash cams span beginner-friendly models for basic recording needs, to premium 4K cameras with advanced smart features. We also offer car accessories that take care of other aspects of your driving experience, including tire health and interior tidiness. Thanks to our top-notch engineers and R&D team, we are able to keep optimizing product capabilities via OTA software updates. From image quality enhancements to smart feature upgrades, we continue delivering value to our customers even after purchase.
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