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Polarisation Filter

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For photos without reflections of water and glass and colourful images of nature and light, the polarisation filter offers the solution.

 

Polarisation Filter

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{{item.description}} {{item.product_tag}} Kamera Express Photospecialist GM Foto PhotoGalerie

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    For photos without reflections of water and glass and colourful images of nature and light, the polarisation filter offers the solution.

     

    What does a polarisation filter do?

    A polarisation filter is a type of filter that lets light through only if it has a specific direction. By allowing it only from a certain direction, colours in your photos can be made much sharper and the unwanted effect of reflections removed. In the past, with analog cameras use was still made of a linear polarisation filter, but with the arrival of the digital camera the circular polarisation filter is now used. The filter is built up from two rings: one for attaching to the camera via screw thread and a second one in order to determine the strength of the effect. Since not all the light is let through, you therefore also lose a part of the light. Fortunately, with a longer shutter speed, larger aperture or higher ISO value, you can adjust the lighting again.

    Functioning of a polarisation filter

    With the front ring of a polarisation filter, you can adjust the effect of the filter. It is important to know how the filter works. Light always has a direction, usually this is straight ahead. If light is reflected on for instance water or an object then the direction changes. The filter anticipates this by only allowing the light in from a particular direction. By altering the direction with the ring, the effect therefore also changes. For another camera angle, via the rotating ring, the functioning can easily be adjusted. In addition to all the functionalities, it also offers protection for the lens.

    Use in the case of blue light

    A frequently used possibility of setting to work with a polariation filter is while photographing blue light with potential cloudscapes. By applying the filter, the contrast in the light changes and the blue light is given a brighter and darker character, whilst clouds on the other hand become whiter. This change is the most effective when the camera is at an angle of 90 degrees from the sun, so the sun is to the left or right of the camera.

    Effectiveness against reflections

    Polarisation filters are effective against reflections on various objects. Because the filter can prevent the reflection by only allowing the light from a particular angle. This functionality is very welcome when you take a picture of a building with glass, objects under a glass plate and underwater life. In the water of a sea or lake, a reflection from the light often occurs, sometime this is really beautiful, but at other times you prefer to show what is happening under the water surface. By means of the filter, you can capture both fish and underwater plants. You get the best effect when you photograph from an angle of 45 degrees on the water surface.  

    Colourful nature images

    Not only the application on water can make images much deeper and more intense, but also the application in wet nature areas. The jungle in which the leaves of trees and the ground surface are wet are given much more colour by the application of the filter. Pale green becomes bright and intense, and pale brown trees become darker. The use in wooded areas such as the tropical rain forest or mangrove gives colourful results.  

    When not to use

    There are also situations and types of photography for which the use of a polarisation filter is less suitable. When you use a wide-angle lens, the effect of vignette (dark spots) is increased with the filter and so more spots occur. For recordings with a completely grey cloud cover, the effect is barely visible. On the other hand, in some situations, reflection is desired and it is not necessary to use the filter. It is useful to experiment with this and see what effect suits you better.

    Choice for a filter

    When you buy a filter, you should take into account that the shape fits with that of the lens or camera. Always consider for which lenses you will use the filter. With an adapter ring it is possible to mount a polarisation filter onto a lens with a different shape.B+W, Hoya and Rodenstock offer both high-quality filters in the higher price class and afforadable models for people with a lower budget.

     
     
     
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