This is a demonstration of the use of a circular polarising filter on your dash-cam.
I have a new DOD LS300W dash cam and a 27mm circular polarising filter (bought separately) which are a good combination. I intend to demote my present DOD F520 to the rear window if the new camera lives up to expectations.
The lens housing on the camera is 29 mm diameter.
The filter has a 27 mm diameter thread then a grooved shoulder 30 mm diameter then a 30 mm diameter housing for the filter that can be rotated 360 degrees.
Now take some black electrical insulating tape and cut a piece 8 mm wide by about 180 mm long. Hold the filter with the thread towards the camera lens and wrap the tape around both to hold them together. Be careful to not let the tape overlap the rotating filter mount. I have used blue tape to show you the final result.
Now mount the camera using the supplied mount in the car – mine fits nicely behind the rear view mirror with the power lead tucked into the head lining and down the A pillar to the underside of the dash, where it is fed across to the cigar lighter socket.
You now need to adjust the polarising filter to minimise reflections in the windscreen. This video shows the effect – but would have been more impressive if it had been a sunny day – and not late evening at sunset when it was raining.
My new DOD LS300W arrived today and I have yet to be able to use it on the open road in bright daylight. I took it for a brief spin in dull rainy conditions and have found that the picture quality to be significantly better in these conditions than my DOD F520 camera. However – the new camera has a much wider lens – 140 compared with 120 on the F520 – which means the vehicles are smaller in the picture. The new camera picks up reg numbers in vehicles being followed fine – but the reg numbers of approaching vehicles are not legible. Whether this is because of the wider angle lens or the poor light and rain I have yet to determine. Watch this space – but it might be months before we see any sun again.
