The Danubia K6 Kellner 6.3mm 1.25" Astro Telescope Eyepiece, is fully coated and offers a wide angle field of view. It is ideal for locating smaller objects in the night sky and easily fits to a telescope with a 1.25" diameter eyepiece aperture. The Kellner style of eyepiece, is an achromatic one and has a three lens design which gives it good eye relief and is a terrific aid to extended night time viewing.