Think of light as wooden ice-cream sticks that are flying towards a set of bars. The bars will only let the sticks that happen to be aligned with the bars through, and absorbs all the other sticks. Before the filter, the light is moving in lots of different polarizations. After it has passed through the filter, all the light is moving in the same linear polarization.

Cross polarizationphotogrammetry

The waterproof housing offers adequate protection from moisture and dirt therefore the camera can be used outdoor and in adverse weather conditions. The camouflage body of the camera easily can be camouflaged in the wilderness. Power supply is mains independent using AA batteries. Recorded data can be transferred to a computer from the SD card directly or through a USB cable or send them to you buy Mail or MMS. Through the implementation of the infrared flash the camera can be used at night just as well. This makes the Observation camera interesting for all who want to automatically take images of movement in an area of observation.

Cross polarizationfilter

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You can buy sheets of polarization film from most photographic outlet – all you need to do is to cut off a piece that is big enough to cover your light source, and another piece that is of a size of the right size to stick in front of your camera lens. Then, the hunt starts for finding the most interesting types of plastic to start playing with…

Crosspolarizedlightgeology

A special highlight of this observation camera is the MMS/E-Mail function. Therefore the camera must be provided with a SIM card. You can get a daily report about the number of taken pictures at a specified time or you can have a determined number of pictures sent to you by MMS or E-mail automatically every day.

The BRESSER SSL E-Mail/MMS Observation camera offers 12MP resolution and an infrared flash for automated animal photography as well as security applications. This enables good image quality at day and night. Photo and HD-video recordings are in color (at night in black and white due to the use of infrared flash). The data is stored on an SD-Card.

Photos in this post were found by searching for Cross Polarization (or Cross Polarisation) on Flickr. The cutlery image is by Elyssa, the mad colours image is by Geartron, and the CD cover insert is by _maverick_.

The effect that can be seen when cross-polarizing light is startling. Chances are that you’ve seen cross-polarized images before, and thought that they were digital image manipulations or done with really advanced lighting. The opposite is true: Due to the manufacturing process used in creating injection-moulded clear plastics, the plastic takes on some ability to polarize light itself. When the polarized light passes through these plastics, then, their phase gets altered. By filtering out all other light with the second polarizer, you get the colorful, acid-flashback-style images.

Cross-polarization exploits this by placing objects made of some types of plastic between the first and the second polarizer. For this particular set-up, you’ll want to put your first polarizer in front of the light source, then your plastic object, and then use the second polarizer in front of your lens.

Cross polarizationphotography

Imagine now, if you will, what would happen if you were to put another set of bars, rotated 90 degrees in relation to the first set of bars. In theory, none of the ice-cream sticks would get through, right? Well, that’s how Polarizer filters work, too. Of course, no polarizer filter is perfect, so some light will always get through, but the vast bulk of light is filtered out.

Geekery and science meets photography: Cross-polarization is a fantastic little technique that exploits a quirk in the way polarizers work.