With a clear center, each of these four filters have a specially designed pattern designed to enhance the Holga's natural focus vignetting. Drawing the eye toward the center of an image, these filters are excellent for a unique documentary, portrait and fine art style images. Set includes 1 red, 1 yellow, 1 blue, and 1 neutral density filter in soft surround. Must be used with Holga Lens/Filter Holder Item #147120, sold separately. Image shown with Holga camera and Lens/Filter Holder not included.