Cokin

Cokin is a French company based in Rungis, Val -de- Marne department, which specializes in the production of optical filter systems for photography, video and film. The company is best known for her creative filter system, invented by the French photographer Jean Coquin 1978 and brought to market. The name is commonly used for this Cokin filter system.

In contrast to conventional filters, which are either screwed into the filter size of the lens in front of the front lens, or attached there, Jean Coquin developed a system which is based on a universal bracket and filter - standard sizes are used. The filter holder is screwed by means of an adapter ring in the lens. This system has the advantage that a filter for various objective lens diameter can be used. There is only one adapter ring for the existing lens diameter required.

Cokin filters are made ​​of CR-39, a synthetic material, which is also used in the manufacture of ophthalmic lenses and contact lenses. Compared with filters from optical glass like the quality of this plastic drop something.

The filter system includes almost all in the photograph on the application coming filters such as polarizing filters, UV - filter, color correction filters, graduated filters, neutral density filters, effects filters, etc., and matching modular sun visors. The system includes 200 filter variants in rectangular or round design.

The Cokin filter system is manufactured in four sizes, which meet the needs of the simple viewfinder cameras to professional large format camera and film camera.

• A Series: for filter thread diameter of 36 mm to 62 mm, filter size 67 x 67 mm
• P- series: for filter thread diameter of 48 mm to 82 mm, filter size 84 x 84 mm
• Z -PRO Series: for medium format cameras and film cameras, filter size 100 x 100 (150 ) mm
• X -PRO series: for medium and large format cameras and film cameras, filter size 170 x 130 mm

Round filter with directional characteristics as polarization or star filter can be rotated arbitrarily in the holder. Also rectangular filter with directional characteristic, such as the graduated filter can be rotated to the desired position in the holder on the adapter ring.

In a holder up to three filters can be combined and a plurality of holders can be placed above one another. Only light loss and possible vignetting set limits here.

The holder system was further developed with the proliferation of first analog, then digital viewfinder and video cameras. These cameras have very different lens diameters, which are often without thread. For Cokin offers a bracket system that can be attached to the tripod socket of the camera and thus is independent of the lens training. Another variant can be fix by a magnetic adapter ring. This adapter ring is stuck on the camera or lens.