Orion 8850 2-Inch Refractor Telescope Mirror Diagonal Mirror diagonal with a 90 degrees design features polished optics to yield maximum performance of big 2" telescope eyepieces 2" diagonal for use with refractor telescopes Accepts 2" eyepieces and includes 1.25" eyepiece adapter for use with smaller 1.25" eyepieces and accessories Fits 2" focusers on refractor telescopes A convenient accessory for switching between large 2" and 1.25" eyepieces when viewing with a refractor telescope