Universal Lens Filter for ~50mm aperture lens, camera, scope View and photograph safely! Transmission: 1/1000 OF 1% Uses ISO: 12312-2 approved SOLARLITE Film (100% safe for direct solar viewing) Use over any camera lens Safe on spotting scopes Works on telescopes Affordably priced Spring-folded shape holds on For Lenses, Binoculars and telescopes of 50mm aperture. Fits over outside diameters of 40-65 millimeters