For the self-construction of lens filters for telescopes, binoculars, photo and video cameras. Newly developed solar filter film with the optical quality of a high-quality glass filter, but with the durability of a polymer film. Double protection filter due to the polymer carrier material with an additional reflective coating. Produces a very natural bright yellow image of the sun. Observe solar eclipses, sunspots, planetary transits, flybys of airplanes and satellites. The solar filter film protects your eyes thanks to the double protection filter.