The Danubia 90 Degree Diagonal image for 1.25 inch &352;reverses &352;the image in the telescope for easier viewing. Useful for both Danubia by Dorr reflector & refractor telescopes, it is also angled for ease of use. This is a 1.25 Inch eyepiece for a Danubia by Dorr &352; Kellner 17 &352; Telescope.