ENHANCED CONTRAST - Features dichroic multi-bandpass coatings, optimizing views of nebulae by blocking unwanted light pollution for superior celestial observation. SUPERIOR OPTICAL CLARITY - Crafted with Schott B270 glass, this filter ensures minimal distortion and maximum light transmission, revealing intricate details of deep-sky objects. PRECISION FIT - Designed with M28.5 x 0.6 threads, seamlessly integrates with standard 1.25' telescope filter threads, ensuring secure and stable attachment for your equipment. DURABLE PROTECTION - The black anodized aluminum filter cell provides robust housing, safeguarding the delicate glass and ensuring longevity, even with frequent use in the field.