These filters mount magnetically in just seconds without using threads. Multiple filters may be stacked for more creative control. The kit has a mounting ring that mounts on any camera lens with a 82mm front filter thread. It also includes a magnetic front cap with a convenient holder.Each filter is made from premium German optical glass and is multicoated to reduce flare and optimize light and color transmission. In addition each filter features a layer of protective coating to make it scratch-resistant waterproof dustproof and oil-resistant. This makes them ideal for use in harsh environments and also easy to clean. The slim magnetic mounting rings make the filter resistant to vignetting even on wide-angle lenses.