Formatt Hitech 100mm Landscape Filter Kit Colby Brown Signature Edition Premier (for 77mm Lens Thread) Contains 3 different styles of the popular ND filters in addition to a 77mm adapter Premier kit includes a 105mm Circular Polarizer and adapter ring for 100mm Aluminum Holder Includes an exclusive technique booklet authored by Colby Available in three sizes 67mm, 85mm and 100mm Made in the UK on the most advanced computer-controlled manufacturing equipment in the industry