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The Celestron Omni 15mm Eyepiece is a 4 element premium symmetrical Plossl optical design, which determines your telescopes magnification and can give you a wider field of view. The features of this eyepiece include lens edges to minimise internal reflection and maximise contrast, and fold down rubber eye cups for comfort of use. Rubberised grips come as standard as well.The eyepiece has multi layer coating group on each lens surface to maximise light transmission and contrast, and each Omni goes through a two step anodizing process to prevent reflection from the top eyepiece barrel, unlike most other manufacturers that use reflective surfaces.SpecificationsFocal Distance 15Diameter 3.18 cm 1.25Usage Erecting Eye Piece
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