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    This item includes three tools for collimating a Newtonian reflector having an 1 ¼” diameter focuser:
    • A sight tube having centered crosshair wires. This is sometimes called a peep tube.
    • A Cheshire eyepiece. This has an opening on the side for providing illumination.
    • An autocollimator eyepiece.
    This also includes the instruction book shown in the photo.
    The eyepieces and instruction booklet were bought as a package, so the booklet references exactly those eyepieces.
    I don’t use these any longer, but I’m offering them at a low price (that includes shipping!) for someone who wants to learn how to collimate a Newtonian reflector.

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