3.25" (82mm) Helios Solar Glass Binocular Filters. Fits Optical Tube Diameter 2 7/8" (74mm) to 3 1/8" (79mm). SF325P
This pair of premium solar filters are safe for solar viewing when mounted on binoculars. They are rated ND5, which means that 99.999% of the sunlight is blocked. The apertures are made of a high quality, reflective coated, Helios Solar Glass, and mounted into aluminum outer cells. The filters slip over the sky end of your optical tubes. They are secured and centered to the optical tubes with nylon thumb screws and felt tabs. They are packaged in a foam lined storage box, and included are instructions for use and care. A natural yellow-orange image of the sun is viewed through the filters. You will be able to see sun spots, surface granulation, eclipses, and planet transits. If you are not sure these are the right size filters for your binoculars please click on FAQ and follow the directions for, "How do I find the right size filter to order?"