The Tiffen 4 x 5.65" Glimmerglass 1 Filter is a beauty filter whose function is two-fold: in addition to modifying the appearance of the image itself, it also features a sparkling appearance when viewed from the front, instilling more confidence in the model. The filter itself helps to soften skin details, blemishes, and wrinkles. It also produces glowing highlights and a mild reduction in contrast for a more ethereal appearance. The 1 density provides more softening than the 1/2, but less than the 2.