CPL filter for Yi 4k/4k+

Leo_SF

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I just received this 37mm CPL filter and it looks excellent. It even has a ring to turn the CPL filter to get it in the perfect position. I got two of them for $8.10 with S&H.

Each filter is 2.84$ with free S&H. I elected to pay a couple more dollars for faster shipping but to each their own.

I tried using a 24mm CPL filter with my Yi 4k+ but it created vignetting so this 37mm filter looks perfect. I got an adapter for Yi from Ebay for a few bucks. AliExpress has it for about two dollars now.

https://www.aliexpress.com/item/Hig...L-C-PL-Filter-Lens-For-Canon/32729726180.html

https://www.aliexpress.com/store/pr...for-Xiaomi-Yi-Camera/3197059_32836256861.html
 

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Have you tested the widest FOV's? I found with all of my action cams:Gitup, Yi origional , 4k+, that if the filter doesn't fit VERY close to the camera face/lens that vignetting will be apparent! I use none smaller than 52 mm! Illustrated is a re-worked 58 mm filter adapter sold for the Hero 4 Black
 

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I tested the 4k+ today and I can report there's no vignetting with the 37mm adapter +CPL filter.

I did not perfectly align the CPL filter so it wasn't able to eliminate all the dash reflections at the bottom but it seems solid. I think if I could zoom out more(like with the 16mm lens I tried on my dashcam), the reflections would not be seen at all.

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I accidentally dropped the adapter+filter straight down on the front part (glass side) on the pavement from chest high and aside from two nicks on the aluminum, the glass survived. Impressive.
 
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