Skip to content
Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.
Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.

Features

  • Fits telescopes with 1.25" focusers or visual backs, 90° viewing angle, best for observing objects overhead
  • Accepts standard 1.25" eyepieces, Barlow lenses, and other accessories with a 1.25" insert barrel

Celestron 1.25" Star Diagonal

The Celestron 1.25" Star Diagonal slides into the focuser (1.25") of your refractor or catadioptric telescope and accepts standard 1.25" eyepieces, allowing you to view objects more comfortably. A diagonal that is angled at 90º helps avoid neck strain when looking through through the eyepiece.

Please note that a 90º diagonal will display images that are right side up, but left to right orientation will be reversed.

You may also like

  • $42.55 USD - $42.55 USD
    $42.55 USD
    $42.55 USD - $42.55 USD
    $42.55 USD

    David Astro 90° Diagonal - 1.25"

    DAV-DIAG-1.25
    5 in stock

    The 1.25" Mirror Diagonal is a must-have accessory for astronomers, providing a comfortable viewing angle and improved image quality during telesc...

    View full details
    $42.55 USD - $42.55 USD
    $42.55 USD
    $42.55 USD - $42.55 USD
    $42.55 USD
  • $249.95 USD - $249.95 USD
    $249.95 USD
    $249.95 USD - $249.95 USD
    $249.95 USD

    Celestron Dielectric Star Diagonal with Twist-Lock - 2"

    CEL-93573
    Only 3 left!

    Features Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings Provides...

    View full details
    $249.95 USD - $249.95 USD
    $249.95 USD
    $249.95 USD - $249.95 USD
    $249.95 USD
  • $39.95 USD - $39.95 USD
    $39.95 USD
    $39.95 USD - $39.95 USD
    $39.95 USD

    Celestron Omni 2x Barlow - 1.25"

    CEL-93326
    Only 1 left!

    Features Double the magnification of each eyepiece you own with the Omni 2X Barlow Lens Keep the eye relief of your eyepieces while getting 2X the ...

    View full details
    $39.95 USD - $39.95 USD
    $39.95 USD
    $39.95 USD - $39.95 USD
    $39.95 USD
  • $109.95 USD - $109.95 USD
    $109.95 USD
    $109.95 USD - $109.95 USD
    $109.95 USD

    Celestron X-Cel LX 9 mm - 1.25"

    CEL-93423
    Only 1 left!

    Features X-Cel LX eyepieces, optimized for planetary viewing, offer a 60° field of view through a six-element fully multi-coated lens system Pop-up...

    View full details
    $109.95 USD - $109.95 USD
    $109.95 USD
    $109.95 USD - $109.95 USD
    $109.95 USD
  • $149.00 USD - $149.00 USD
    $149.00 USD
    $149.00 USD - $149.00 USD
    $149.00 USD

    David Astro Penta Prism Diagonal - 1.25"

    DAV-PENTA-1.25
    5 in stock

    The David Astro Penta Prism 90-Degree Diagonal is a non inverting non reversing diagonal. It’s particularly suited for use with the David Astro Pre...

    View full details
    $149.00 USD - $149.00 USD
    $149.00 USD
    $149.00 USD - $149.00 USD
    $149.00 USD