How to Install a 70mai CPL Filter and Cut Dash Cam Glare
By 70mai Official Store | Innovative Dash Cams and Accessories ... | Published: 2026-10-15
Category: How-to Guides
A 70mai CPL filter cuts windshield reflections and boosts color in your dash cam footage. Follow these steps to install it correctly and avoid common mistakes.
Quick answer
A 70mai CPL filter reduces windshield reflections and intense sun glare, making road details clearer and colors more vivid in your dash cam footage. Install it by aligning the filter with your dash cam lens, rotating the ring until reflections fade, then locking it in place. Check that your windshield tint won't interfere before you buy.
Why a polarizing filter matters for dash cam footage
Dash cams often capture distracting reflections from your dashboard, sky, and oncoming headlights. A circular polarizing lens (CPL) filters out polarized light, which reduces these reflections and deepens color saturation. For example, the 70mai CPL Filter for Dash Cam 4K T800/T800E/T400/A810 Lite is designed to cut surface reflections on your windshield or intense sun, making it easier to see the road ahead. It also protects your lens from fingerprints, scratches, and dirt, helping you get clearer, more durable footage. If your windshield has a tinting film, be aware that it may impact CPL functionality, so test before relying on it.
Check compatibility before you buy
Not all CPL filters fit all dash cams. 70mai offers model-specific filters: the 70mai CPL Filter for Dash Cam 4K T800/T800E/T400/A810 Lite fits those models, while the 70mai CPL Filter for Dash Cam 4K Omni is made for the Omni. If you own a 4K A810, you can also get a CPL filter as part of the 4K A810 Bundle, which includes the front cam, rear cam, memory card, hardwire kit, CPL filter, and battery pack. Always confirm your dash cam model before ordering.
Step-by-step CPL filter installation
- 1. Power off your dash cam and clean the lens: Turn off the dash cam and use a microfiber cloth to gently wipe the lens. Remove any dust or fingerprints. A clean lens prevents trapped debris under the filter.
- 2. Align the filter with the lens: Line up the filter's threads or mounting tabs with the lens barrel. Most 70mai CPL filters are designed to screw or snap onto specific models. Do not force it; if it doesn't align easily, check that you have the correct model for your dash cam.
- 3. Attach the filter without over-tightening: Gently screw or snap the filter into place until it is snug. Avoid over-tightening, which can damage threads or make removal difficult. The filter should be secure but not immovable.
- 4. Rotate the filter to minimize glare: While watching the live view on your dash cam screen or app, slowly rotate the outer ring of the filter until reflections on the windshield or dashboard fade. This adjusts the polarization angle. If you see no change, your windshield tint may be interfering; test in different lighting.
- 5. Lock the filter in place: Once you find the angle that best reduces glare, tighten any locking ring if your filter has one, or note the position so it stays put. Mark the position with a small dot if needed for future reference.
- 6. Test and adjust as needed: Drive in conditions with strong reflections (sunny day, wet road) and check footage. You can fine-tune the rotation angle if glare returns. Polarization effectiveness can vary with sun angle; a slight rotation may be needed for different times of day.
Product facts
- 70mai CPL Filter for Dash Cam 4K T800/T800E/T400/A810 Lite: 70mai CPL Filter for Dash Cam 4K T800/T800E/T400/A810 Lite reduces surface reflections on your windshield or intense sun, enhances color saturation, and protects your lens from fingerprint, scratch, and dirt. This filter helps you see the road more clearly and capture more accurate colors, while adding a layer of lens protection.
- 70mai CPL Filter for Dash Cam 4K Omni: 70mai CPL Filter for Dash Cam 4K Omni reduces surface reflections on your windshield or intense sun, enhances color saturation, and protects your lens from fingerprint, scratch, and dirt. If you own the 4K Omni, this model-specific filter ensures a proper fit and the same glare-reduction benefits.
- 4K A810 Bundle: Front Cam + Rear Cam + Memory Card + Hardwire Kit + CPL Filter + Battery Pack: 4K A810 Bundle includes an A810 front cam, an RC12 rear cam, a 256GB micro SD card, a parking hardwire, a CPL Filter, and a battery pack. This bundle gives you a complete setup with the CPL filter included, so you don't have to buy it separately.
