WonderPana FreeArc Filter Holder Features Provides the ability to mount a variety of 145mm filters and more! Doubles as a hood to help protect your lens from damage, scratches, fingerprints and the elements Lightweight, aluminum-alloy construction with a corrosion-resistant, black anodized finish for durability Attaches to the lens securely as if it was a part of the lens itself, ultra wide construction to eliminate vignetting 145mm Neutral Density 16 Filter Features Decrease the effective ISO of high-speed film and allow it to be used outdoors in bright situation Enables slow shutter speeds to be used to record movement in subjects such as waterfalls or cars Film subjects such as snow, sand or other bright scenes that can cause overexposure Premium grade optical glass filter; high quality, double threaded, coated ND16 filter 145mm Neutral Density 32 Filter Features Decrease the effective ISO of high-speed film and allow it to be used outdoors in bright situations