Orion 5125 1.25-Inch Standard Tele-Extender

From the Manufacturer

Essential extender for eyepiece-projection astrophotography with Schmidt-Cassegrain telescopes. Permits high-magnification eyepiece projection astrophotography of the Moon and planets with a Schmidt-Cassegrain telescope. Provides fixed projection magnification. One end threads into visual back (over 1.25" eyepiece), other end to a camera T-ring. If you have a Schmidt-Cassegrain telescope, get a tele-extender and try your hand at taking awesome, high-resolution astrophotographs of the Moon and planets!