The resin filters are made from lightweight, optically polymeric materials, which makes then touch, easy to handle and they can be wiped clean. Every filter is individually hand made by skilled technicians and is the passed through a rigorous quality control system to ensure 100% accuracy and consistency.Sky blue to add realistic colour to flat skies. Graduated filters feature an area of colour at one end of the resin, with the opposite end remaing clear. This enables the colour or effect to be placed in a specific area of the frame by the positioning of the filter either up or down in the holder. The transtion from colour to clear can be either fast (hard graGraduated filters feature an area of colour at one end of the resin, with the opposite end remaing clear. This enables the colour or effect to be placed in a specific area of the frame by the positioning of the filter either up or down in the holder. The transtion from colour to clear can be either fast (hard grad) or slow (soft g