The Cokin Magne-Fix Neutral Density Medium (25mm Outside Diameter) gives photographers with unthreaded camera lenses a chance to achieve special effects and filtration that they might not ordinarily have a chance to do.
This system features a unique mounting technique whereby you peel off a protective film from the back of a mounting ring that contains an adhesive surface which is then pressed against the edges of your lens. The reverse side of the mounting ring is magnetic. The Magne-Fix Circular Polarizing Filter is then held firmly against the magnet. When finished with the filter, grasp it firmly and remove it.
Neutral Density (ND) Filters have several uses and offer the possibility to achieve otherwise unachievable results. They enable the shooter to adjust exposure without affecting color balance. ND filters appear grey and reduce the amount of light reaching the film.
Determining which neutral density filter yields ideal results for any given lighting situation takes knowledge, experience and a collection of such filters. Speaking generally, the 2-stop value (ND 0.6) effectively compensates average situations.
Note! Cokin has performed tests to ensure that the magnetic system does not create interference with cameras or phone devices
Neutral Density Filters Have Four Main Uses
- To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars
- To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background
- To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situation
- To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure