2 diffusion effects in one filter, reducing multiple surfaces and potential reflection from stacked filters Gently smoothes out unwanted blemishes and wrinkles Gives a silky smooth look to textured surfaces Subtly softens details in the unique SOFT/FX style, while adding a gentle mild glow to highlights Effect of lighter grades is more subtle, with higher grades becoming gradually more noticeable Made from water white glass Tiffen Black Soft/FX½ Filters are available in: 4 x 4, 4 x 5.650, 6.6 x 6.6 sizes and Grades 1/8, 1/4, 1/2, 1 & 2