Photo Filter screw which is applied in front of a lens of a camera to achieve a certain effect. ND neutral density filter variable that can be configured from ND2 to ND400. To set the level of ND just do a rotation of the filter ring. Reduces light contrast and the light incident on the target. The higher the level, the darker. Particle filter comprisings of a grid of zinc and polarized. Features double thread to set other filters or shields that filter. Manufactured glass lens and metal ring