LIGHT POLLUTION ELIMINATED: Each Night Sky filter delivers incredible starlight definition and true color neutrality. Each Night Sky filter is weather sealed in our rugged X4 traction frame and features an incredibly durable MRC16 and nanotec coatings for easy and fast cleaning. | RUGGED WEATHER-SEALED TRACTION FRAME: Built for harsh environments, our industry first traction frame completes the weather sealing on your lens to protect against dust, moisture and other outdoor elements. The rugged traction frame also allows a strong grip for removal and attachment. | BUILT FOR OUTDOOR PHOTOGRAPHERS: Artificial light pollution ranges between 570 to 610 nanometers on the visible light spectrum. Artificial light pollution can reduce starlight definition by up to 50%. The orange color cast decreases contrast between the stars and the space behind them, making an the otherwise black backdrop of space look orangish. | ELIMINATES LIGHT POLLUTION NON-DESTRUCTIVELY: Eliminating light pollution is essential to capturing beautiful Night Sky images, however finding a location to shoot without light pollution can be incredibly difficult if not impossible depending on where you’re shooting. | 25 YEARS SUPPORT: Backed by our 25 Year Ironclad Guarantee, each Night Sky filter is designed to last decades of continual use in the field.