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Celestron's Omni 9mm Eyepiece is designed for comfortable near and deep-space astronomical observation. It is engineered with a 4-element lens configuration, blackened edges, and anti-reflective fully multi-coated optical surfaces to ensure bright and clear high-contrast images with true color transmission across the entire 50° field of view. With a 1.25" diameter barrel, it will fit the most common size drawtubes, visual backs, and accessories. The housing is made of a lightweight and durable aluminum alloy with a reflection-limiting matte anodized finish, and a fold-down eyecup make this eyepiece ideal for comfortable viewing for extended periods with or without eyewear.