Item Type: Solar Filter Film Material: Aluminum alloy, PET, aluminum foil Weight: Approx. 290g/10.2oz Outer Frame Diameter: Approx. 216mm/8.5in Light Aperture: Approx. 192mm/7.6in Package List 1 x Solar Filter Film 1Precise Specifications: The telescope solar film has an outer frame diameter of 216mm/8.5in, supports lens sizes ranging from 184 to 210mm/7.2 to 8.3in, features a clear aperture of 192mm/7.6in, and is equipped with M5 16mm screws. 2PET Coating: The solar film consists of PET coated aluminum foil, serving as a solar filter. Unlike solar eyepieces, an astronomical telescope requires a solar filter to observe the sun. Without proper filtration, the high brightness of the sun can cause damage to both the eyes and the instrument. Even with the solar film, it is still straightforward to locate the sun in the mirror. 3Advantages of Durability: The solar film allows for viewing of the sun in red and yellow hues, offering durability and suitability for long term use in natural environments. It withstands wind and rain and can easily be cleaned with a clean cloth or tissue, and even water if necessary. 4Light and Radiation Reduction: The solar film effectively reduces light and harmful radiation without compromising contrast in captured images. Using it as a solar filter can achieve better image quality, allowing for the easy recording of sunspots and solar surface activities. 5Exquisite Workmanship: The film material is bright silver on both sides, featuring a thickened design for a secure and reliable observing experience. Compliant with ISO standards for solar filter films, this product ensures eye protection during solar observations. In case of any light leakage before use, please stop using it immediately.