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Designed for use with Twinstar brand Reflector Telescopes, this erecting eyepiece flips the image you see right-side-up. As you may know, Reflector Telescope use mirrors to collect light which means they usually project an "upside-down" image. When you are looking into space, this is insignificant because there is no upside-down in Space. However, if you want to use you telescope during the day to look at things here on Earth, you will probably want the image flipped back the right way. This eyepiece is compatible with any telescope or optical device that uses a standard 1.25 inch diameter eyepiece. Your image is inverted and magnified 1.5 times.