The only test I have available to me to evaluate a polarizer is to use the polarized light from a current generation LCD monitor along with some non-polarized light to see what the filter eliminates.

The setup behind the two images that are part of this review is simple. I put a DSLR on a tripod in front of a set that included mostly polarized light from a monitor as well as a bit of non-polarized light from an accent light set to the side. I kept the ISO, aperture and shutter speed constant.

In one image, I had the K&F circular polarizer set to the minimum and the other snap is set to the maximum. I also included a histogram from both images to the right of where the computer monitor is in both images. The filter did a good job of filtering out the majority of the light from the monitor indicating it does a filtering polarized light.

While my test setup isn’t a laboratory and I expect a real lab such as DxO would smile at my test, it’s valid in the sense that I’ve had both good and bad results using it. I also used this setup to test the UV filter included in this kit and could see no change. I didn’t post images because if there are any small differences they wouldn’t be visible in a JPEG posted to the Web.

I rate both these filters highly. I could detect no color cast from either of them.