SUPERIOR FILTER QUALITY - Crafted with SolarLite film, this iOptron filter ensures safe solar observation by blocking 99.999% of intense sunlight, revealing intricate solar details with exceptional clarity. ENHANCED LIGHT POLLUTION REDUCTION - Experience optimized contrast and clarity during solar viewing, as the filter minimizes glare and enhances details of sunspots and surface features effectively. PRECISION THREAD SIZE - Designed to fit telescopes with 70mm to 90mm tubes, the filter's adjustable frame guarantees a secure and precise fit, preventing light leakage and ensuring stable observations. OPTIMAL TRANSMISSION RATE - With a transmission rate of 1/1,000th of 1% (Optical Density 5), this filter provides the perfect balance between brightness and safety, allowing detailed solar study.