Orion 5343 2 to 1.25-Inch Telescope Eyepiece Adapter Allows you to use 1.25" eyepieces in any 2" telescopes focuser, star diagonal, or holder An affordable way to increase the number of eyepieces to use with your 2" focuser-equipped telescope Ideal for using high-power, low focal length 1.25" eyepieces in a big 2" telescope focuser Great for performing lunar and planetary viewing in larger telescopes