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Orion Telescopes

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4mm Tele Vue Radian Telescope Eyepiece
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  • 4mm focal length Radian 1.25" eyepiece for comfortable viewing at the high power needed to study planetary and lunar detail as well as compact deep-sky objects
  • Seven-element lens design exhibits the renowned Tele Vue quality, providing flat, sharp images over the entire 60° apparent field
  • Fully multi-coated for superior light transmission and threaded for use with 1.25" eyepiece filters
  • Long 20mm eye relief
  • The Instadjust click-stop eyeguard positions your eye right where you need it to see the full field of view, whether you wear glasses or not


Item #  08387
Mfg Model #  ERD-04.0
  • Design
    Proprietary
  • Eyepiece focal length
    4.0mm
  • Barrel size
    1.25"
  • Apparent field of view
    60.0°
  • Eye relief
    20.0mm
  • Coatings
    Fully multi-coated
  • Number of elements
    7
  • Filter threads
    Yes
  • Parfocal
    Yes
  • Field stop diameter
    4.2mm
  • Barrel security recess
    Yes
  • Blackened lens edges
    Yes
  • Rubber eyeguards
    Yes
  • Body material
    Aluminum
  • Case
    No
  • Weight (oz.)
    12
  • Dimensions
    3.6 in. x 1.8 in.
  • Warranty
    Limited lifetime

Orders received by noon Pacific Time for in-stock items ship the same business day. Orders received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

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