With the Cokin filter A062 Center Spot Grey 1 you can emphasize the center of a recording while the surrounding area faded and displayed with a purple color. With this filter you can provide your photos with a dramatic color effect.
Working with the center spot Filter
The filter is directly influenced by the set aperture and the focal length. If you use a larger aperture, the filter will have a softer effect on the photo. The size of the circular area that is clearly displayed is greater when using a longer focal length. The exposure measurement must be done without the filter attached to the lens. If your camera has spot measurement, you do not have to remove the filter from the lens to determine the exposure.