Polarizing Film Sheet - set of 10, Model: 93493, Gadget & Electronics Store

I used these to temporarily convert a regular bright field microscope to a polarizing microscope. You need the top filter above the objectives and below the eyepiece. You need the bottom filter just above the light source. You turn the bottom filter to get the effect you want. It works great with crystals like ascorbic acid crystals. These sheets seem to be high quality and a good value. They are sufficiently thick, but cut easily with scissors to make circles. They have protective plastic on both sides which you peel off. The protective plastic is held on by static cling. There is no adhesive.

I purchased these filters for demonstrations in my physics classes. From each 8 cm x 8 cm square, I cut four smaller squares, which were still sufficiently large enough for my purposes. In most of the images, I am holding 8 cm squares that still have their protective films on. Pairs of filters did a good job at blocking light when their axes were turned 90° from each other. An individual filter noticeably cut down on the glare of light reflecting off of the linoleum tiles in my classroom (I've included a photo of the polarization axis parallel to the floor, and another perpendicular to the floor, for comparison).

It is really, really important to remove the protective covering from each piece of film. When I first received these, and removed them from the nice, protective, plastic sleeves, I thought the optical quality was awful. I expected clear plastic, and they were translucent. There is a protective plastic layer on both sides of the the polarizing plastic that is not obvious (in fact, I saw it mentioned in another review when I was about to give the product 1-star!). Once you peel the protective plastic off these sheets, they work very well. My ranking of 4-stars instead of 5 is due to their ability to fully attenuate light when the polarizers are crossed. I tested the attenuation of the crossed polarizers on a bright filament, and other brightly lit scenes. It is pretty good, but you can definitely still see any brightly lit source, so the polarizers are a bit "leaky". However, the are completely adequate for "hobby" experiments.

I have an old Nikon upright compound microscope that I am using to look at collagen fibrosis in heart tissue. However, it was missing its polarizer and analyzer. I bought this and cut one sheet into two circles. One was placed in the base of the condenser above the light source. The other one was glued onto a metal circle and then placed above the specimen on the slide. By turning the top filter, I was able to see collagen birefringence perfectly!

These polarizing sheet are intended for kids to play with. Do not buy these for professional use. It would be impossible for you to take pictures through these sheet. The quality if below terrible, and they are full of scratches. EDIT: To all people who answered, I have to make an edit in this review. These polarizing sheets come with a protective plastic layer on the front and on the back. When I was using them I did not take them off, thinking it was part of the polarizing film. For this reason it was very hard to see thru and the quality was terrible. When I took them off however, the scratches were gone and the quality was good, even to take pictures though them ! Remember to take off the protective film on the front and on the back !!

Used these to fix my Yamaha LCD Tachometer. The lcd screen was no longer readable and the outer piece of film had curled up. I gambled $10 that I could do it myself vs $250 for a new tach. I won. These are the perfect size for doing the job. I still have enough left over to do more gauges. Fix your lcd screens yourself. Dont throw them away and buy new. It's really not that hard. If you're gonna toss it try and fix it first. You have nothing to lose.

Got for use as a science project but see potential use for photography or other applications but sheets are very small and didn't seem worth it overall but was the most affordable option out there. FYI seller, not everyone needs 10 sheets or wants that specific size.

Definitely NOT static cling. Trimmed a piece for my mp3 player for use outdoors; peeled the "protective" film off both sides and it certainly did not "cling" to the mp3 player. Very disappointing.