Sorry I haven't tried recording videos from the back facing to the interior with CPL on.Looks good
Facing in that direction, it will be reducing glare off the side windows?!
Yeah, I know $20 for a small CPL is like crazy.....Very clean! Too bad I haven't noticed it before (or you haven't posted it a bit sooner ), I took a bit different approach and used this.
EDIT: Oh, 20$. Ok, I regret nothing.
Yeah, I know $20 for a small CPL is like crazy.....
I was thinking the same thing (Polarized Film), may I know how it looks?
Thanks.
My DIY CPL for the A139 rear camera has not worked out very well because I'm getting extensive haze or fogging around the CPL. There is a small air gap - the UV cement is not a complete ring - but perhaps it needs more air?I simply re-used an old dashcam CPL (from my SG9665GC, but any circular CPL could be used). It's held in place by a couple of dabs of UV glue. This was a bit tricky to install within the car since the camera is not removable from its mount.
If I like the result after a few weeks of testing I'll dismount the camera and re-affix the CPL with a tidier glue edge, then re-mount the camera on the rear screen.
View attachment 60547
I’ve used square CPL’s stuck on with small bits of black 3M pad in the corners, so plenty of ventilation, seems to work fine.the UV cement is not a complete ring - but perhaps it needs more air?
I removed the CPL yesterday and found that the fogging is trapped between the two layers of the CPL, so it seems to be a CPL failure rather than a ventilation issue.My DIY CPL for the A139 rear camera has not worked out very well because I'm getting extensive haze or fogging around the CPL. There is a small air gap - the UV cement is not a complete ring - but perhaps it needs more air?
View attachment 61220
Why does the CPL have two layers?I removed the CPL yesterday and found that the fogging is trapped between the two layers of the CPL, so it seems to be a CPL failure rather than a ventilation issue.
I don't know why it has two layers, but it's not a protective layer for shipping. The Viofo CPL has similar construction.Why does the CPL have two layers?
Technically the C bit is a seperate layer to the PL bit, but they are just coatings on a single layer of glass/plastic.
Where you possibly supposed to remove one of them - a protective layer for shipping?
Edit: Looking at your image, maybe the UV cement has split the two layers of glass? But I don't know why there are two layers...
The Viofo CPL has similar construction.
Almost identical. I found that the plastic frames for the A129 Pro and the SG9663DR CPL were a fraction of a mm different. I can't tell which is which by eye.The Viofo filter was identical to the Street Guardian CPL. Both companies collaborated behind the scenes to produce the filter to save costs. Ever notice that they also often use the identical housings and other components?
Almost identical. I found that the plastic frames for the A129 Pro and the SG9663DR CPL were a fraction of a mm different. I can't tell which is which by eye.
But in general yes, I was aware that they shared a number of resources to make housings, CPL filters, hardwire kits etc.
CPL removes polarized (reflected) light and then lets the light oscillate circularly in all planes - this affects the accuracy of exposure and possibly focus (not sure). While the PL filter works the same way, the light behind it can have some negative effect on the lens. That's why the multiple layers .. I'm writing this in very layman's terms, I recommend Wikipedia or another description of the CPL filterI don't know why it has two layers, but it's not a protective layer for shipping. The Viofo CPL has similar construction.
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I don't know why it has two layers, but it's not a protective layer for shipping. The Viofo CPL has similar construction.
You describe a PL filter but not a CPLThe CPL had polarizing film sandwiched between two layers of optical quality glass. The polarizing film is a dichroic layer, sometimes called “pola foil,” made from polyvinyl alcohol (PVA) plastic and it is very thin. The film is stretched during manufacturing, forcing the molecules in the plastic to line up in long parallel chains with tiny gaps between them like the bars of a jail cell, or a picket fence. These chains are invisible to the naked eye. This stretched polymer is then dipped in a solution of iodine, and the iodine molecules attach themselves to the polymer chains. The resulting structure allows the pola foil to absorb light waves that are parallel to the long chains while allowing waves that are perpendicular to pass through unaltered thus blocking light waves coming from other angles.
The name "polarizer" comes from the fact that it was invented in 1929 and then revised in 1938 to its current form by Polaroid the company that later invented the Polaroid camera. Polarizing filters are more or less made the same way they were 85 years ago with some enhancements and improvements by companies like HOYA in Japan.