Gosky 120mm Eclipse Solar Filter- Telescope / Binocular /Spotting Scope Solar Filter (Silver) - Sun Filter -For Front End Outer Diameter 81-112mm (3.19"-4.41")-Get Ready for Solar Eclipse, 2017 The Solar Filter is for Telescope/Spotting Scope/ Astronomy Binocular front end outer diameter from 81-112mm (3.19"-4.41") . With this filter the Sun will be of a neutral, eye-pleasing white color. See sunspots, eclipses, and planetary transits of the Sun safely with your telescope and this filter Made with high-quality, streak-free and blister-free Baader Astro Solar Safety Film CAUTION: Never look at the Sun, either directly or through a telescope, without a professionally made protective solar filter installed that completely covers the front of the instrument, or permanent eye damage could result. Optical density: 5.0 Aperture of the telescope