VIOFO CPL Filter Circular Polarizer for A129 Duo / Plus / IR / A119 V3 / mini 2 Dash Camera Lenses

When I first got this filter, having looked up multiple videos and posts online about how to adjust it if it was not adjusted properly, the first thing I did was do what all those videos said to do. I held it against my mobile phone screen which was displaying an image of protractor, on which was highlighted a red line at a 45⁰ angle. I twisted the filter so that at 45° from it's horizontal fitting position it was supposed to completely cut out the light from the phone screen. Three things then: 1. It does not cut out the light at 45⁰. 2. It does not cut out the light completely as shown on video in any circumstance. 3. It only cuts out the light to the maximum extent that it can when twisted to 0⁰ (vertical) and not at 45⁰. Point 2 may be because of video photography, lighting and metering on whatever was used to record the videos. Anyway, I initially thought that the filter wasn't aligned properly, but before man-handling the lens in order to turn it I tried something else which made more sense. I sat in my car holding the lens in the proper orientation, long slit up, front facing windscreen and at the same angle as the lens was set on the dashcam (basically vertical and horizontal to the windscreen). I was holding it at a distance from my eyes where I could see the reflections on the windscreen of the side pillars, speaker grilles and vents on my dashboard. It was not a bright day but they were visible on the windscreen. Whilst looking through the filter they disappeared. Twisting the filter to the left and right I saw the reflections coming back into view. At no point other than at the level proper position for fitting did I see an improvement in how it reduced reflections. So obviously the only assumption I could make from this is that it arrives pre-set and in it's correct orientation. In my opinion blindly following the instructions online is a mistake because when mine was turned 45⁰ I could see all the reflections. The videos online are all dated from and around 3 years ago. Maybe something has changed since then, I don't know, but physically looking through it in the orientation that it is intended to be utilised, the pillars, speaker grille and vents all vanished. It was a dull day so there weren't really strong reflections from the dash itself but my pillars are light cream, and they weren't visible any more. So in the end I put the CPL on the dashcam without forcing an adjustment to make it block out the maximum amount of light it can at 45⁰ as the videos all indicate is correct, and I left it at it's preset 0⁰. I do not really know why adjusting it like they do on youtube is necessary but I suggest you do the same as I did before blindly trying to adjust to a chart on a screen. Sit in the car and look through it. I think Viofo are reputable enough to make sure that the manufacturers adjust these properly before supplying them. While I was looking through it during the test, though It certainly added definition to the scene it also definitely lowered the light passing through it, as it obviously would. Please see the oictures I've uploaded and look at the vents reflections vanish. I used to take photographs a lot, back in the days of film and more recently with digital autofocus SLR cameras. Regardless whether it was a linear or circular polarizing filter, I used to adjust exposure up slightly when using one. I did the same with the A119, adjusting it +⅓, further testing will see if I need to adjust it one stop higher or even back to 0, depending on how the sensor copes with the reduction. In a perfect world it will adjust itself but I need a bright day to do those tests. As for cost, it is expensive for what it is. But that being the fact should also mean that it arrives configured to immediately be used from the box, with no adjustment. I think reducing the glare, especially on sunny days is worth it.

Brought these for my Dashcam as it kept getting glare on the windscreen which you could see on the video footage. 90% reduced glare. Very happy with this and easy to fit.

Brought this as seen reviews of the dash cam with it on and with it off. Works great during the day and really reduces the reflections on the inside of the windscreen where you can see the dash. The picture is so much clearer and crispy. Night is not so good for me. I've got a heated windscreen, and the night footage with the CPL filter on is not very clear at all and fuzzy. I've assuming the fine heater wires, nighttime and what the CPL does to the image just doesn't all work together. CPL off at night is better.

Does what it claims, what else is there to say. Clips onto the camera lens (whether front or rear) nice and easy and cuts out reflections from the glass and glare off the road for clearer recordings in challenging lighting conditions. Worth it if you want your dashcam to be of any use if you drive outside of midday in summer... ended up buying a second one after getting one to test on the front cam and seeing the difference vs the rear.

Cuts down glare significantly, and was very easy to install - did not need to adjust the lens whatsoever.

Easily fitted and removed. Comes in a foam storage cradle (keep in the car). It's good at killing lens flare and reflections from the sun, but don't expect it to eliminate all reflections of the fascia. I'm going to have to make a thin card cover (sprayed matt black) to go over one piece of shiney black plastic trim that really shows up. It probably needs removing for extra-urban driving at night as it reduces the amount of reaching the camera. Be careful to keep your fingers off the 'lens' surface and only use a proper lens CLOTH to remove finger marks.

Easy to fit to dash cam, I have A119s V2 and makes a difference in terms of reducing reflections. The only down side was mine didn't seem to be aligned properly when I received it, so I had to rotate it and test it before I found the correct orientation. It's not difficult to do and there are videos online showing you how to do it, it just takes a few mins to do as I found it better to take the card out and test the footage on a larger screen to make sure. However, it is well worth doing as it does reduce reflections quite a bit. A polariser does reduce the amount of light entering the dash cam, so is not ideal for night time, but I have not removed mine for night time, as yet and still found the footage on my dash cam to be fine so far. The beauty of this polariser is that it can be unclipped quite easily, if you wish to do so and I may do it when we get back into winter when most of my driving will be in the dark again.

Fits well and it does help with reducing reflections somewhat but they are still there. I have seen stronger CPLs on larger cameras

Råkade köpa detta filter fast det inte behövdes till A139 då det numera ingår.

Apparemment nécessaire pour éviter des reflets sur l’image, je pense que c’est indispensable mais ne devrait pas être u e option.

مافي فرق الصدق

Très bon produit, conforme à la description. Livraison rapide et bien emballée. Je suis satisfait de mon achat. Merci !

Gesamteindruck: Ich habe mir diesen CPL-Filter für meine Dashcam geholt, weil mich die starken Reflexionen des Armaturenbretts in den Aufnahmen gestört haben. Die Verarbeitung wirkt hochwertig und der Filter lässt sich sehr einfach auf die Linse setzen. Nach der ersten Fahrt war ich direkt begeistert, wie viel klarer das Bild wirkt, da störende Lichtreflexe fast vollständig verschwinden. Vorteile: - Die Bildqualität verbessert sich deutlich, da Spiegelungen auf der Scheibe effektiv minimiert werden. - Die Montage ist kinderleicht und der Filter hält sicher an der Kamera, ohne zu verrutschen. - Die Farben in den Videos wirken satter und natürlicher, besonders bei sonnigem Wetter. Nachteile: - Bei Fahrten in der Nacht wird das Bild durch das Glas ein klein wenig dunkler, was aber in der Natur eines Polarisationsfilters liegt. - Man muss den Filter anfangs kurz richtig ausrichten, um den bestmöglichen Effekt zu erzielen. Fazit: Für jeden, der Wert auf saubere Videoaufnahmen ohne störende Spiegelungen legt, ist dieser Filter eine sinnvolle Ergänzung. Das Preis-Leistungs-Verhältnis passt hier absolut, da die Sichtbarkeit von Details wie Kennzeichen bei Gegenlicht deutlich erhöht wird.