Orion E-Series 7-21mm Zoom Eyepiece
Item #08549
4.8 / 5.0
The Orion E-Series Zoom eyepiece lets you change magnification easily. Twist the body to change the focal length from 21-7mm, providing a range of power. Long eye relief allows eyeglass wearers to enjoy the entire view. Threaded for 1.25" filters.
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  • More Info
    • The Orion E-Series Zoom eyepiece allows you to change magnification power without swapping out eyepieces
    • A simple twist of the zoom eyepiece housing changes the focal length from 21mm to 7mm, providing a variety of viewing magnification powers
    • The eyepiece consists of six lens elements, which are fully multi-coated with anti-reflection coatings for bright and clear views, rich in contrast
    • Exceptionally long 18mm-16.3mm eye relief range allows eyeglass wearers to enjoy the entire field of view without needing to remove their glasses.
    • The 1.25" barrel is threaded for use with like-sized Orion eyepiece filters.

    Now even casual telescope users can enjoy the benefits of zoom eyepiece technology. A simple twist of the barrel of the affordable E-Series Zoom eyepiece changes the focal length from 21mm to 7mm, or to any focal length in between. That makes it ideal for locating an object at low magnification, then quickly zooming in to higher magnification for closer inspection, all without changing eyepieces! Actual magnification range will depend on the focal length of your telescope, but as an example: in an Orion SkyQuest 8" Dobsonian reflector with a 1200mm focal length, this eyepiece provides a continuous magnification range of 57x-171x. And the E-Series Zoom works equally well for astronomical or terrestrial viewing in smaller refractor or Cassegrain design telescopes.

    This 6 element telescope eyepiece boasts fully multi-coated optics and exceptionally long eye relief ranging from 18mm (at 21mm) to 16.3mm (at 7mm). The apparent field of view angle ranges from 40 (at 21mm) to 57 (at 7mm). The 1.25" barrel is threaded for standard eyepiece filters. A very nice value in a quality zoom eyepiece!


    Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

    Product Support

    Visit our product support section for instruction manuals and more

  • Specs
    • User level:
    • Design:
    • Eyepiece focal length:
      21.0mm - 7.0mm
    • Barrel size:
    • Apparent field of view:
      40.0° - 57.0°
    • Coatings:
      Fully multi-coated
    • Number of elements:
    • Filter threads:
    • Parfocal:
    • Field stop diameter:
    • Barrel security recess:
    • Blackened lens edges:
    • Rubber eyeguards:
    • Body material:
    • Case:
    • Weight (oz.):
    • Dimensions:
      3.7 in. x 1.7 in.
    • Warranty:
      One year
  • In The Box

    Zoom eyepiece

  • Important Shipping Information

    Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order 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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