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What is a CPL Filter?

Designed to Reduce Glare & Reflection to Improve Video Quality in Your Dash Cam

What is a Circular Polarizing Lens (CPL) Filter?

A CPL (circular polarizing lens) filter is a lens that you can put over your existing dash cam lens to reduce glare and reflection, which in turn improves video quality. Vehicles with dashboards that have shiny or light-colored plastic tend to suffer from the most reflections which can be distracting and make details like license plates and vehicle makes/models harder to pick up - this issue is actually quite prevalent for many vehicles.

We found the need for the CPL filter to be even more relevant with newer cars that have a more raked back windshield. These windshields help with aerodynamics and pedestrian safety but can create much more glare than more vertical windshields. When the camera is mounted so far back, it catches all the glare and reflections from the dashboard between the lens and windshield.

It's also easy to slide the filter off of the camera if needed, such as during times when there aren't many light sources on the road. However, even at night, street lights can still cause the same sort of reflection as sunlight during the day - the CPL filter can help with that too. Overall if your vehicle is prone to dashboard reflections, we definitely recommend checking out this CPL filter.

BlackVue CPL Filter

VIOFO CPL Filter

Thinkware CPL Filter

Select the items above to purchase the CPL filter for your dash cam.

Installation Tips

  • Make sure there is no dust on the camera's lens or on both sides of the CPL filter. You can remove dust using a dedicated air blower or even something as simple as scotch tape.

  • Adjust the CPL filter by rotating it. We recommend parking in a sunny area and looking at the screen or WiFi app when you adjust it. Refer to the video below for a demonstration of how we adjust the filter

  • At night you may find the CPL filter makes the video too dark, you may want to adjust the exposure in the settings or remove the filter altogether at night

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Got More Questions?

Not to fret, our in-house product experts are here to help. We have spent years curating helpful content and video guides, helping customers with their dash cams, but we understand that we can always do better. Contact us using the form below and we'll get back to you as soon as we can. We love what we do, because we're here to help you make the most informed purchasing decision.

What is a CPL Filter?

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[Signature Bundle] BlackVue DR900S-2CH + BlackVue B-124X Review
Awesome Dash Cam
Hi Manny, we're trying our best to help our customers and keep it business as usual even during this pandemic. Thanks for leaving a review!
Solid 5 Star Camera
Hi Christian, thanks for leaving a review. You did indeed make a great choice! You can check it live when you're not in the car by connecting the BlackVue dash cam to the Cloud. You'll need a mobile hotspot to achieve this, but it's entirely possible! Ask us if you need help :)
Excellent
Thanks for leaving a review, Nina!
Awersome
Thanks for leaving a review, Lincoln!
Viofo A129 duo
Hi Firoz, thanks for shopping at BlackboxMyCar. Happy birthday to your kids, and hope they love their dash cam!
VIOFO a129 Duo
Hi Robert, thanks for shopping at BlackboxMyCar. If you have any questions, please don't hesitate to reach out!
VIOFO A129 : High Functionality at a Good Price Point
Hi Iain, thanks for leaving a detailed review. This will be helpful for other customers looking to purchase a VIOFO A129 for their Jeep vehicles. If you need anything else, don't hesitate to let us know.
Excellent quality and support
Hi Derek, thanks for your compliments. We try our best to provide all the information one needs to confidently find the right dash cam for them. Glad to see you're loving your VIOFO - let us know if you have any questions in the future.
Dash cam 4K
Hi West Dog, in the future, we do recommend contacting our team at info@blackboxmycar.com or live chat with us on our website. Our team is here to help you find the right settings based on what you need. Our team should have reached out to you directly already, but let us know you still have any questions.
Blackvue 750
Hi Edward, thanks for shopping at BlackboxMyCar. Glad to hear that the DR750 met your expectation :) Comeback any time!
Spliced cable
Hi Christopher, that's really good to hear. Glad it all worked out - thanks for leaving a review!
Scanner
Hi Christopher, awesome :) Glad you love the 1S!
Install Kit
Hi Alan, thanks for leaving a review and for shopping at BlackboxMyCar! Come back anytime if you have any further questions :)
Love my BlackVue
Hi Chris, thanks for shopping at BlackboxMyCar. Great choice on the BlackVue! Come back anytime :)
Cellink New Extended Battery Pack
Hi GB, thanks for leaving a review. If you're facing any further issues, please don't hesitate to contact our support team at info[at]blackboxmycar.com. We can help you with finding a solution for that.
Fast shipping, easy install, great HD dashcam
Hi Pete, thanks for leaving such a detailed review. This is awesome - we're so glad to hear that our team have been able to help you with everything you needed for a dash cam, and we're so grateful to hear that you've shopped with us for all of your vehicles. Please don't hesitate to come back anytime, and we hope you continue to trust us for your automotive goods. In the future if you're experiencing overheating issues, feel free to ask us directly because we can always assist you in troubleshooting a solution for it. Thanks!
VIOFO A129 from BlackBoxMyCar meets expectations
Hi Arthur, thanks for leaving a review! We do offer micro-fuse adapters on our website, so don't hesitate to ask us if you have any auto-related questions in the future. We're here to help!
Thinware q800 pro
Hi KevzBart, thanks for leaving a review. Glad you love it!
Nice dashcam for the money
Hi Mike, thank you for sharing your honest review. We're glad to hear that you've found a dash cam that's right for your vehicles, and you found them with us at BlackboxMyCar. We do love it when customers share their footage with us, so we'd love to see additional feedback from you once you've had more chances to play with your VIOFO. That said, we do want to clarify one thing regarding the battery pack, the amount of time that it takes to charge will be dependent on your vehicle's battery. For some of our customers, as long as they're driving minimum 30 mins a day, then it will be enough for them to recharge. It's especially important for customers during this time as many of them are working from home so having parking mode on for an extended period of time is important. That said, thank you for shopping at BlackboxMyCar. Do let us know if you have any questions in the future.
extra SDMini Card
Hi Alan, thanks for shopping at BlackboxMyCar!
Perfect Transaction
Thanks for shopping with us, Stephen! Glad our team was able to help you out.
Great Products, Excellent Customer Service
Hi Jose, thanks for shopping at BlackboxMyCar! The VIOFO A129 Duo has been a big seller for us, so we apologize for any delays during this time. Thanks for leaving a review!
good service and fast shipping
Hi Neil, thanks for shopping at BlackboxMyCar! The CPL filter does tend to saturate certain colours, so if you're finding that the edges of the frame are a bit darker than before, then we do recommend adjusting the brightness within the settings.
Viofo v3
Hi Kyle, sorry to hear that you had trouble with picking up your package. To clarify, you shouldn't have been required a signature during this period of COVID-19 anyways, according to this page: https://www.fedex.com/en-ca/coronavirus.html - 'Temporarily suspended for most deliveries in Canada and the U.S. A physical signature is not required for FedEx Express and FedEx Ground shipments except when an adult signature is required.' We're not sure what happened, but we're sorry to hear that this happened to you. That said, thank you for shopping at BlackboxMyCar and we're glad to hear that at the very least, you're enjoying your VIOFO!