The build-process is simple. First measure the dimension of your flash. Then draw the outline and the later bends on the cardboard with a ballpen, this helps for folding accurately.

Interestingly,  point-and-shoot cameras work with linear filters, so if you are using a P&S, you could use one side of the goggles for the flash and the other one for the lens. (See hyperphysics.phy.str.gsu.edu to learn more about the different kinds of polarizers and how to use them)

Now you should have a closer look to the goggles. The direction of light is important for the effect, so make sure the outside of the goggles faces the flash. The camera should look through the goggles like your eye did before. I used the goggle as a template for the hole and wrapped everything with gaffa tape.

On a bright day it works best if you are in a 90 degrees angle to the sun, but there will always be some light reflected by the surrounding or diffused by clouds which still reduce the effect. (See the differnce between the right and left sides of the image below)

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Polarizer filters can be used to enhance contrast and saturation in landscape photography and reduce reflections or glare on shiny surfaces such as water. The effect is maximized by aligning the polarizer on the camera so that the polarizing direction is perpendicular to that of the light you want to block.

Crosspolarizedlightgeology

The commonly used polarizer goggles for 3D cinema contain pretty good linear polarizer filters. The autofocus of your DSLR might get into problems with a linear polarizer – it loves circular polarizers. However, a linear polarizer in front of a light source is just fine.

Karl E. Wenzel (Charly) or terapixel is research assistant at the Department of Computer Architecture. Started with photography as a hobby in 2009 and gets not bored to tinker with lenses and other camera equippment.

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Cross polarizationfilter

The last step is to vary the filter on your lens to maximize the effect. Instead of the flash itself a permanent lightsource can be used for this alignment. Just make sure the filters are in the same orientation you’re planning to use them. By turning the filter on your lens you can vary the effect until the majority of the light is blocked. A good idea is to mark this position for later use. Of course the position of the lightsource can still be varied, but tilting one filter would require re-alignment of the other.

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Every lightsource could be modified to emmit polarized light. But some devices (such as displays and some lasers) already emmit polarized light. See the images below for examle images illuminated with an iPad.

Cross polarizationantenna

Cross polarizationphotography

Stress in transparent plastic changes how light goes through it, making the stress  visible and produces an interesting colorful image.

Some subjects benefit a lot of this effect, while others don’t, but it’s certainly fun playing with it. See some examples below.

Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

However, if we do either of those, it will restrict the light gathered by the lens. ... When we look at coupling light from a well-collimated laser beam into a.

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Crosspolarizedlightmicroscopy

This article shows how a polarizing filter for a flash allows to make use of the effect with artificial light. Some subjects will look gorgeous while others may be rendered in an odd way but it’s certainly fun playing with the effect and you can still vary the level by turning your filter on the lens. In a nutshell, we are going to polerize the light coming from the strobe to better control its specular higlights.

The Intensity of a light is multiplied with the Light color. The value can be between 0 and 8. This allows you to create over bright lights.

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Cross polarizationphotogrammetry

All you need is a camera, a light source and some polarizer filters. You might get these 3D goggles for free when visiting a 3D movie in cinemas (but don’t steal the shutter goggles) or buy some polarizing foil in your camera shop. Of course a lens filter on your flash would also work.

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Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

Cardboard of a milk-box is excellent material for flash diffusers. While the shiny surface of the inside is not required for the polarizer diffuser we want to build here, it is well suited for other types of flash diffusers (e.g. crazy macro photography).