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Olivon's 17mm 70° Wide-Angle Eyepiece provides an immersive observational experience with its 70° wide angle of view and anti-reflection fully multicoated optics. Its lens is configured with eight elements in five groups, and is parfocal with all other Olivon 70° eyepieces - so there will be little or no need to adjust the focus when changing between different size eyepieces in the same series. The eyepiece features a double-barrel configuration that allows it to fit both 2" and 1.25" focusers without the need for adapters, and its twist-up eyecup allows the eyepiece to be used comfortably with or without eyewear.