The Danubia K6 Kellner 6.3mm 1" Astro Telescope Eyepiece, is a quality eyepiece, which offers a wide angle field of view, so is great for locating smaller objects in the night sky. Easy to fit to a telescope with a 1" diameter eyepiece aperture, the Kellner style of eyepiece, is an achromatic one and has a three lens design. It gives excellent eye relief and is a terrific aid to extended night time viewing.