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Celestron Omni 56mm - 2"
Celestron Omni 56mm - 2"
Celestron Omni 56mm - 2"
Celestron Omni 56mm - 2"
Celestron Omni 56mm - 2"
Celestron Omni 56mm - 2"

Celestron Omni 56mm - 2"

by Celestron
SKU CEL-93328
$129.95 - $129.95
$129.95
$129.95 - $129.95
$129.95
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  • 56mm focal length provides the lowest power for any given telescope
  • 47° apparent field of view delivers expansive celestial vistas
  • Utilizes a 46mm field stop, the maximum possible in a 2" barrel
  • Exceptional 52mm eye relief for comfortable viewing, even with eyeglasses
  • 4-element, multi-coated Plössl design for high-contrast images
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  • Description
  • FAQ
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  • In the Box
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  • Celestron Omni 56mm Eyepiece - 2"

    The Celestron Omni 56mm Eyepiece uses its 4-element Plössl design and 56mm focal length to deliver the widest possible true field of view from a 2" barrel. Its 47° apparent field of view is ideal for framing large deep-sky objects, and its massive 52mm of eye relief ensures viewing comfort for all observers. The optical system features multi-coated lenses and a 46mm field stop, maximizing light transmission and contrast on faint targets.

    The 56mm Focal Length and 46mm Field Stop: Maximum True Field of View

    This eyepiece is engineered for one primary purpose: to show you the largest possible patch of sky your telescope can deliver. By combining a long 56mm focal length with a 46mm field stop—the physical limit of a 2" barrel—the Omni 56mm becomes the ultimate finder eyepiece. In long focal length telescopes like Schmidt-Cassegrains or EdgeHDs, it allows you to frame entire targets like the Andromeda Galaxy (M31) or the Pleiades star cluster (M45) that are too large for higher-power eyepieces.

    This low-power, wide-field capability is essential for locating objects and appreciating the grand scale of the Milky Way's richest star fields. It's also an excellent choice for daytime terrestrial viewing, offering sweeping panoramic vistas.

    A Generous 52mm of Eye Relief for Viewing Comfort

    With an exceptional 52mm of eye relief, the Omni 56mm stands out as one of the most comfortable eyepieces available, particularly for those who wear glasses. This long distance allows you to see the entire 47° field of view without pressing your eye against the lens. The integrated fold-down rubber eyeguard helps you maintain the correct viewing distance and blocks stray light, improving image contrast.

    While this extensive eye relief is a significant benefit, it can make eye placement sensitive for some observers. Using the eyeguard to stabilize your position is key to preventing blackouts and enjoying a comfortable, immersive view.

    High-Contrast 4-Element Plössl Optics

    The Omni 56mm employs a classic 4-element, 2-group Plössl design, renowned for its excellent image sharpness and high light transmission. Every air-to-glass surface is multi-coated to reduce reflections and enhance image brightness and contrast. To further improve performance on faint deep-sky objects, the internal barrel is blackened to absorb stray light, and the lens edges are blackened to prevent internal reflections from degrading the view.

    • Threaded for Filters: The 2" barrel is threaded to accept standard 50.8mm filters, allowing you to enhance views with nebula or light pollution filters.
    • Secure Fit: A machined safety notch in the barrel helps prevent the 15 oz eyepiece from accidentally slipping out of the focuser if the thumbscrew loosens.
    • Durable Construction: The main body is machined from aluminum and features a knurled rubber grip for secure handling in all conditions.

    Celestron Omni 56mm vs. TeleVue 55mm Plössl: Key Trade-Offs

    When choosing a low-power 2" eyepiece, the Omni 56mm is often compared to the TeleVue 55mm Plössl. While both aim to maximize the true field of view, they offer different user experiences based on their specifications.

    • TeleVue 55mm Plössl Advantage: The TeleVue offers a slightly wider 50° apparent field of view compared to the Omni's 47°. For observers seeking the most immersive-feeling view at this focal length, the TeleVue has a small edge.
    • Celestron Omni 56mm Advantage: The Omni provides a massive 52mm of eye relief, significantly more than the 38mm offered by the TeleVue. This makes the Omni far more comfortable for observers who must wear eyeglasses to correct for astigmatism. The Omni is also typically available at a more accessible price point.
    • Field Stop: Both eyepieces use the same maximum 46mm field stop, meaning they frame the exact same true field of view in the sky. The difference in apparent field is a matter of presentation, not a difference in how much you can see.

  • Why should I use the Omni 56mm eyepiece in my Celestron Schmidt-Cassegrain telescope?

    A Schmidt-Cassegrain (SCT) has a long focal length, which naturally produces high magnification. The Celestron Omni 56mm provides the lowest possible power, turning your SCT into a rich-field instrument capable of viewing large objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31) in their entirety.

    Is the Omni 56mm a good choice for a fast (f/5) Dobsonian telescope?

    Generally, no. In an f/5 telescope, the Omni 56mm will produce a very large exit pupil of over 11mm. Since the human eye can only dilate to about 7mm, this means a significant amount of the telescope's light-gathering ability is wasted. You may also see a distracting shadow of your telescope's secondary mirror in the center of the view.

    What is the benefit of the Omni 56mm's 52mm eye relief?

    The 52mm eye relief is exceptionally long, which is a major advantage for eyeglass wearers. It allows you to keep your glasses on and still see the entire 47° field of view without any vignetting. For all users, it provides a comfortable, un-cramped viewing position.

    Can I use filters with the Celestron Omni 56mm eyepiece?

    Yes. The 2" (50.8mm) mounting barrel is threaded to accept all standard 2" astronomy filters, such as light pollution, nebula, or color filters. This is crucial for enhancing views of faint deep-sky objects from light-polluted locations.

    How does the 47° apparent field of view on the Omni 56mm feel compared to wider eyepieces?

    The 47° apparent field of view will feel less like a "spacewalk" than an ultra-wide 82° or 100° eyepiece. However, because of its long 56mm focal length and 46mm field stop, the Omni 56mm shows the same amount of *actual sky* (true field of view) as any other 2" eyepiece. The view is simply less magnified.

    What is the purpose of the notch on the barrel of the Omni 56mm?

    The notch is a safety feature. It provides a recess for the focuser's locking thumbscrew to engage with. This prevents the eyepiece, which weighs 15 oz, from falling to the ground if the thumbscrew accidentally becomes loose during use.

  • Focal Length 56mm (2.20")
    Barrel Size 50.8mm (2")
    Apparent Field of View 47°
    Eyepiece Type Plössl
    Optical Design 4-element, 2-group
    Optical Coatings Multi-Coated
    Eye Relief 52mm (2.05")
    Field Stop Diameter 46mm (1.81")
    Filter Threads Yes (2")
    Eye Guard Yes, Fold-down
    Body Material Aluminum
    Dimensions 119mm x 64mm x 64mm (4.7" x 2.5" x 2.5")
    Weight 15 oz (425.24 g)
    Parfocal No
    Waterproof No
    • Celestron Omni 56mm Eyepiece - 2

      Omni 56mm Eyepiece - 2"

      × 1

    • Top Dust Cap for 2-inch Eyepiece

      Top Dust Cap

      × 1

    • Bottom Dust Cap for 2-inch Eyepiece

      Bottom Dust Cap

      × 1

  • Celestron 2-Year Warranty