Gosky 60mm Solar Filter - For Celestron / Orion /Tasco /Bushnell 60mm Aperture Telescope- 60mm PowerSeeker, Observer 60mm AZ, Etc Baader Planetarium Film - Prepare for the Solar Eclipse of August 21 The 60mm Solar Filter is for 60mm aperture telescopes for Celestron / Orion Tasco / Bushnell D=60mm telescope. For telescopes such as 60mm PowerSeeker, Observer 60mm AZ, Etc 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 Optical density: 5.0 Aperture of the telescope. 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. Note: For other telescopes not listed, please measure the outer diameter of the dew tube and make sure it is approximately (3.58")91mm.