Order no. 233.ASF
With this special film it is possible to look directly at the sun with binoculars without danger for the eyes, in order to observe sunspots or an eclipse.
The tear-resistant, CE-tested film with a filter factor of over 100,000 (optical density over 5) reduces the intensity of sunlight by at least 99.999%.
Size 20×29 cm, with detailed instructions for building reliable binoculars and telescopic solar filters.