This graduated filter is specifically made to fit the Fotodiox Pro 100mm Filter Holder as well as the Cokin Z-Pro (L) Series Filter Holder. It features a soft edge gradation, with +2 stop denstiy on the darkest side, gradually decreasing near the center of the filter allowing for emphasis of foregrounds or backgrounds. Color gradually fades out, so the boundary between the colored and transparent sections of lens will not become apparent even with the lens aperture stopped down. Each Filter comes with a clear protective storage pouch.