Polarized Film Sheets 3 PCS 7.8 x11.8inches/20x30cm Polarizer Linear Polarizing Filter Non-Adhesive for Educational Physics Photography Lighting

I needed some reasonable linear polarizers to measure glare from LED headlamps. These work perfectly. I can use them with an SLR and light meter. I have to make a frame but that is simple. The 90 degree blockage is great for this price point. Remember to remove plastic covers.

I purchased this film as I needed it for some experiments in my lab, plus I wanted to add a polarizing film to my families dashcams (it removes blinks on photos/videos, one filter costs ~$15 per dash cam and I have many dashcams, so I saved TONS of money, plus still have 99% of the film left for my experiment)

Be sure to remove the plastic film from both sides. At first I thought the polarizing filter was blurry because of being really low quality. Then I realized there is a plastic film on both sides (quite subtle). When the film is removed, the filter is crystal clear and works great.

sheet curls up, need to bend into shape, other than that its perfect.

I use these to photograph my oil paintings without glare. They work flawlessly for that purpose. There is a film on BOTH sides, once they are removed the sheets work well. This was the absolute best price around for these sheets and I'm very happy with their performance, I've now got glare free photos. I cut mine to fit into my led studio lights and in conjunction with my DSLR lens filter I can easily change the level of glare.

This arrived in good condition, despite being shipped in only a bubble envelope. Has good extinction. BUT, and this is a big BUT, it curls up like a spring, forming a cylinder about 3 inches in diameter. Could not flatten it by weighting it down flat for a long period or by weighting it with heat for a long period. If you want this flat you will need to stick it to a rigid support.

Does exactly what it is supposed to. The protective "Saran Wrap" on both sides can be easily removed by using a piece of duct tape to start a corner. When you remove that from both sides, the polarizing sheet is then nice and clear and ready to use. Otherwise it is diffused. Lots of customers fail to realize this.

The film has extremely poor optical qualities. Anything viewed through it is blurred to the point of being unrecognizable. Additionally, the polarization isn't all that strong. Possibly the most frustrating part is that they do nothing to flatten the film, so it retains the curl that it had on the roll and is difficult to work with.The poor optical qualities make it a dud for photography and the unruly curling makes it a dud for demonstrating the quantum nature of light, unless you want your demonstration to be a comedy.That's a failure of 2/3 of what they advertise it for and given that the picture is of perfectly flat sheets, I think this qualifies as false advertisement.If you buy a new car based on pictures and it gets delivered all curled up an unusable, that's clearly a scam. It shouldn't be any different for other products.