Solomark Deluxe Adjustable 86-117 Mm Inside Diameter Solar Filter, Baader Planetarium Film, for 86-117mm Aperture Telescopes-astrosolar Safety Film Visual-explore the Sun Safely Through a Telescope-discover the Fun of Daytime Astronomy Explore the Sun safely through a telescope with this high-quality solar filter featuring Baader film in a sturdy Plastic Frame Adjustable inner diameter from 86mm to 117mm, to fit the outer tube of telescope 86-117mm, what you get is not for a single telescope, it will cover the most popular range of astronomy 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. Before using any telescope for solar observing, make sure to install all dust caps or other protective covers on all optical components such as finder scopes to keep sunlight from passing through them. Glancing through an uncovered optical system, even for an instant, can cause permanent eye damage. Always install protective caps on all optical instruments if left out during daylight hours. Once attached to a telescope, these filters provide sharp, scatter-free views of sunspots, solar eclipses, planetary transits, solar granulation, and even white filamentary faculae - the latter of which cannot be seen with most other solar filters. Baader Quality Film , the ensurance of quality