Item Type: Solar Filter Material: Plastic Weight: Approx. 11g/0.4oz Density: 5.0 (suitable for visual) Installation Size: Approx. 46mm/1.8in Applicable Model: for 40070, 30070, etc.1Essential Eye Protection: When observing the sun with a telescope, the solar filter film is a must have accessory to protect your eyes from potential harm. It ensures safe and enjoyable solar observations without risking eye damage. 2Wide Compatibility: This solar filter film is designed as a universal accessory for telescopes such as 40070 and 30070 models, with a convenient installation size of 46mm/1. 8in. 3High Density Filter: With a density of 5. 0, corresponding to a transmission rate of one hundred thousandth, this solar filter film is suitable for visual observations. It effectively reduces harmful radiation and light while preserving contrast and delivering excellent image quality. 4Precise Fit and Secure Mount: Checking for any light leaks by directly aligning the solar filter film with the sun ensures safe usage. The film should be securely fixed to the telescope's light entry point, ensuring a proper and reliable installation. A thorough inspection guarantees a secure and undamaged setup. 5Strict Safety Measures: During the observation process, it is crucial to strictly prohibit any movement of the solar filter film by other individuals. By adhering to safety protocols, you can ensure a safe and uninterrupted solar observation experience. 1 xSolar Filter