Observe the sun safely with this essential solar filter for 150mm aperture Sky-watcher telescopes! Key Features: Safe, reliable, robust, and durable design. Protects your eyes from harmful solar radiation. Allows you to safely observe sunspots, solar eclipses, and planetary transits. Provides a neutral white image of the sun. Crafted with high-quality, streak-free, and bubble-free Bard Astro-Solar Safety Film. Specifications: Suitable for Omni 150 and similar telescopes. Material: ABS and Composite Film Bard Film Density: 5.0 Filter Aperture: Approximately 135mm or 5.31in Cap Diameter: Approximately 170mm or 6.69in Fits: Skywatcher 150 or 750 Telescopes and similar models. Package Size: Approximately 215MMx215MMx35MM or 8.46x8.46x1.38in Weight: 141g Important Safety Note: Never look at the sun directly or through a telescope without a professionally manufactured solar filter that completely covers the front of the instrument. Permanent eye damage can occur. Package Includes: 1 x Solar Filter