- Diameter: 3.2 cm (1.25 inches), easily attaches to your eyepiece and is securely housed in a durable frame. - Superior Dual-Sided Polish: Enhanced flatness achieved through a dual-sided fine polishing process ensures exceptional optical clarity. - High-Quality Coating: Features a multi-layer coating on both sides, with an anti-reflective coating on the rear that maximizes light penetration while minimizing reflections. - Precision Substrates: Crafted with precisely polished substrates, providing excellent parallelism and smooth surfaces for optimal performance. - Enhanced Contrast: This UHC filter is specifically designed to improve image contrast for celestial observations, making it easier to discern details in nebulae and other astronomical objects. Applications: 1. Perfect for amateur astronomers seeking clearer views of deep-sky objects like nebulas and star clusters. 2. Ideal for astrophotography, where enhanced contrast can significantly improve image quality. 3. Useful for daytime observations as well, allowing for sharper visuals when observing landscapes under bright conditions.