Utilizing an ingenious spring-folded assembly design to hold it securely in place, the 2-pack of Daystar Filters 50mm White-Light Universal Lens Solar Filters allows you to safely view or photograph the sun and solar eclipses. The ULF is offered here in a 2-pack for safe solar viewing with binoculars, or multiple optics and lenses without having to move the filter. They are made of the 12312-2 ISO-certified SOLARITE film, which blocks more than 99.999% of intense light, plus 100% of harmful IR and UV radiation — revealing sunspots and super granules on the solar surface. Made to fit on the front of camera lenses, telescopes, spotting scopes, binoculars or other optics and imaging devices, this version of the ULF can accommodate housings, sunshades, and dew shields with an outside diameter from 50-69mm (1.96-2.71"). The filter has a clear aperture of 50mm, so vignetting may occur when used on lenses and optics that approach the maximum recommended diameter in the size range.