Picture of Polariscope
This is a quick 'n dirty way of building a cheap polariscope.
I got the idea when I pondered what to do with a bunch of cheap 3D cinema glasses I have.

Some background information:

One might think that these glasses are not suitable for this kind of use as they are circular polarized, but there's a trick for this. The quarter wave plate has to be on the correct side, otherwise you will only get linear polarization.
You should definitely play around with some of these before you mount them, there's a bunch of strange effects to discover.

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Step 1: Stuff you need

Picture of Stuff you need
Basically, you need some sort of holder for the filters, for this I used some corrugated fiberboard.
A transparen tape looks best IMHO but you can use any old kind as long as it doesn't come off by itself.
I used a scalpel, a x-acto or any kind of sharp knife should do just fine.
For the light diffusor you can use plain writing paper.

Step 2: Designing and cutting

Picture of Designing and cutting
My filters were almost 6cm across, so i settled for a 8x8cm part where the filter sits.
The piece between these is up to you, I used 10cm but it depends on the size of the objects you want to look at.
Very important to have the filters rotated 90 degrees from eachother, or make the holes circular so it doesn't matter when you rotate them.

Step 3: Final assembly

Picture of Final assembly
First tape one of the filters securely in place. Then with a small strip of tape on the second one you can fine tune the angle so it becomes as dark as possible when you look through them both. Tape the second one down when you are satisfied, verify that it hasn't moved around.
Then one end gets a piece of writing paper, its function is a light diffusor so you get a smoother image.
do we have to put the concave side of the lenses facing each other or the other way round.
so basically on one side we got to use the just the tape and on the other side the 3d glass. or on both the side we got to use glasses?
knglaser (author)  rohitksinghal2 years ago
both filters are used, turned the correct way so the light is blocked
zyckel2 years ago
Works great, thanks.
I have been taking pictures for many years so I had a couple of polarizing filters.
Filters are easily adjusted while looking at a part.
wolfkeeper3 years ago
Are you sure these glasses are circular?

The one's I've looked at have been linearly polarised, at 90 degrees to each other.
knglaser (author)  wolfkeeper3 years ago
yes, its the RealD 3d kind, you know when you can rotate them without the movie being affected
Wow!I like this instructable!
But can normal LCD display play a Real3D video? Can I convert a normal video to a Real3D video?
rimar20003 years ago