1. Sun film for telescopes: This sun film is designed for telescopes with a diameter of 80/100/120/140/160/180/200/220/250 mm. The metal pressure ring ensures a secure fit without glue or adhesives. 2. Durable: Made with a metal outer ring and pressure ring, this sun film is resistant to deformation and offers a long service life. It is built to withstand regular use and provide reliable protection. 3. Safe 5.0 density silver solar film: The sun film features a doublesided silver solar film with a density of 5.0. This ensures effective blocking of harmful solar radiation while allowing safe observation of the sun. 4. Wide ApplicationSuitable for use with cameras, monocular/binoculars telescopes, astronomical telescopes, and birdwatching telescopes. This sun film offers versatile applications and is a musthave for anyone interested in solar observation. 5. Important safety precautions: Before observing the sun with a telescope, always install a solar film to protect your eyes from permanent damage. Ensure the film is checked for light leakage before use and discontinue use if any is detected.