The Cokin A091 Dreams 1 Filter is designed to create a dream atmosphere. On the filter are small circular lenses which create a second image around an unaltered central image. This second image appears more or less as a distinct halo, depending on the focal length, the aperture, & the background. There are 3 different types of Cokin Dreams filters all with a different level of density; starting from 1 (mild effect) to level 3 (the strongest effect). This filter is Density 1.