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The Danubia K25 Kellner is a 25mm eyepiece for Astro Telescopes which is fully coated and offers a wider field of view, so is really useful for locating smaller objects in the night sky. It is easy to fit to a telescope with a 1.25" diameter eyepiece aperture and the Kellner style of eyepiece, is an achromatic one, which has a three lens design. It gives excellent eye relief and is a terrific aid to extended night time viewing.