Solomark Deluxe Metal Adjustable 66-94 mm Inside Diameter Solar Filter, Baader Planetarium Film, for 66-94mm Aperture Telescopes The Solar Filter is for telescopes dew tube front end diameter from 66 to 94mm . A must-have, white light filter for safely observing the sun and sunspots without damaging your eyes 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.