1. Safe Solar Observation: Designed for safe viewing of the sun, this solar filter blocks harmful rays and intense brightness, allowing clear observation of sunspots and solar activity without risking eye or equipment damage. 2. Retractable Design for Convenience: Built with a retractable structure for easy application and removal, this filter enables quick setup for daytime use and compact storage when not in use—ideal for portable telescopes and fieldwork. 3. Telescope Compatibility: Fits a wide range of telescope sizes with an adjustable or snug frame design, offering reliable performance for beginners and experienced astronomers using refractor, reflector, or catadioptric models. 4. Definition Solar Imaging: Enables solar viewing and photography by reducing glare and enhancing contrast, making it a useful tool for astrophotographers capturing solar flares, eclipses, or daily sun movement. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store