Tiffen's 4x4-inch Glimmer Glass 1/4 Diffusion Filter is a unique way to give your portrait subject a clean, fresh, and flattering look. This creative diffusion filter offers you a gradual way to choose the degree of filtration that will complement your subject. While Glimmerglass softens fine details like blemishes, it also adds a soft, flattering glow to the shot that adds a greater sense of glamour. The lightest grades of the filter are subtle, while the higher grades will show noticeably more diffusion. Less ThanBRHigher ThanLess ThanBRHigher ThanThe filter also reduces contrast which will take the harshness out of the shot and present your subject in a more flattering light. The main feature of Glimmer glass is that it produces a silvery glow on the front of the filter that makes your subject feel more confident. That glow adds a psychological element to the shot that makes your subject more receptive and confident that the shoot is going well. In that sense, Glimmer glass is just as effective to look at as it is to look through. The 1/4" Glimmer Glass Filter adds more diffusion while increasing the brightness around your highlights. Contrast continues to diminish. Greater ThanTiffen ColorCore Glass is produced through a process that involves permanently laminating the filter material between two pieces of optical glass that are ground flat to tolerances of one ten-thousandth of an inch, then mounting them in precision aluminum