Fits 2-inch (50.8 mm) eyepieces and standard-size accessories for broad compatibility. Includes a 1.25-inch (32 mm) variable polarizing filter that acts like a dimmer to adjust light transmission. Reduces brightness of the Moon and bright planets to reveal higher contrast and finer detail. Provides finer control of image brightness compared with fixed-transmission filters, enhancing viewing performance. Two to three practical use scenarios: - Moon observation: Lower glare to bring out crater detail and surface texture without eye strain. - Bright planets: Dim the view to improve contrast and reveal banding, belts, and surface features more clearly. - Extended sessions: Use gentle brightness adjustment to maintain comfortable viewing over long observing periods without sacrificing detail. Key attributes - Function: Variable polarizing filtration for adjustable brightness and contrast. - Compatibility: 2-inch eyepieces and standard-size accessories; compatible with existing 2" setups. - Size: 2-inch interface for eyepieces; 1.25-inch (32 mm) polarizing filter element. - Performance: Fine brightness control yields crisper, more comfortable, higher-contrast views compared with fixed filters.