Tokina Cinema Formatt Hitech 6.6x6.6'' Low Contrast 2 Filter PTZ Cam this professional grade diffusion filter incorporates this professional grade diffusion filter incorporates a micro layer of ultra fine black particulates — each particle ranging from slightly smaller to slightly larger than a pixel — to ensure resolution beyond 4K while maintaining precise optical fidelity the Sigma 18–35mm maintains a relatively compact size at 78mm diameter × 121mm length and weighs just 810 grams Increase the Shadow Detail while Reducing Contrast using this Tokina Filter The particulate in the filter spreads light evenly and lowers black levels making for an overall pleasing low contrast effect