Fotodiox Pro 100mm Filter Holder & 77mm Threaded Adapter Ring - fits Fotodiox Pro 100x133mm Filters and Cokin Z-Pro (L) Series Filters Designed for Full Frame, Medium Format or expert DSLR APS-C cameras; also well adapted for Broadcast cameras. Fully adjustable and can be disassembled and reconfigured to accept filters of different thickness (1.6 to 2mm and/or 4mm). Will work with 4" (100mm) filters The large holder reduces the risk of vignetting when shooting with super wide-angle lenses and can be reversed to reduce vignetting and to avoid unwanted glare between the filter and the lens. Z-Pro Series system is compact and very easy to carry thanks to its lightweight. Even with several filters mounted at the same time, it doesn't strain the motor of autofocus lenses. 24 Month Manufacturer Warranty