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Celestron Omni 12 mm - 1.25"
Celestron Omni 12 mm - 1.25"

Celestron Omni 12 mm - 1.25"

by Celestron
SKU CEL-93319
$31.95 - $31.95
$31.95
$31.95 - $31.95
$31.95
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  • 12mm Focal Length for Medium-High Magnification
  • 4-Element Plössl Optical Design
  • 50° Apparent Field of View
  • Accepts Standard 1.25" Filters
  • 8mm Eye Relief
  • Lightweight 1.81 oz (51.5 g) Aluminum Body
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  • Celestron Omni 12mm Eyepiece - 1.25"

    The Celestron Omni 12mm Eyepiece delivers medium-high power views through its classic 4-element Plössl design and 50° apparent field of view. Its optical set features multi-coated surfaces for bright images and a 10.7mm field stop framed by blackened lens edges for enhanced contrast. Weighing just 1.81 oz (51.5 g), this compact 1.25" eyepiece provides sharp views of planets and deep-sky objects, though its 8mm eye relief is best suited for observers who do not require eyeglasses.

    High-Contrast 50° Plössl Optics for Planets and Deep Sky

    The Omni 12mm is built around a proven 4-element, 2-group Plössl optical system that provides sharp, well-corrected images. With a 50° apparent field of view, it offers a classic, immersive window perfect for resolving detail on Jupiter's cloud bands, splitting tight double stars, or framing smaller planetary nebulae. Celestron applies multiple layers of high-transmission coatings to the lenses and blackens the lens edges, which work together to increase light throughput and significantly boost contrast by eliminating stray internal reflections.

    1.81 oz Anodized Aluminum Body with 1.25" Filter Threads

    The eyepiece body is machined from aluminum and weighs a mere 1.81 oz (51.5 g), making it an excellent choice for smaller telescopes where balance is critical. A two-step anodizing process gives the barrel a durable, non-reflective matte finish that resists glare from external light sources. The 1.25" insert barrel is threaded to accept standard astronomy filters, allowing you to easily add a Moon filter for lunar observing or a nebula filter to enhance contrast on deep-sky targets.

    Omni 12mm vs. Longer Focal Lengths: The 8mm Eye Relief Trade-Off

    The Omni series offers a range of focal lengths, and the 12mm model represents a trade-off between magnification and viewing comfort. While it delivers higher power than the 15mm, 32mm, or 40mm versions, its 8mm of eye relief is significantly shorter. This makes the 12mm challenging for eyeglass wearers, who may not be able to see the full 50° field of view.

    • Viewing Comfort: Observers who do not wear glasses will find the view accessible, but those needing vision correction at the eyepiece should consider a model with longer eye relief. The included fold-down rubber eye guard helps with positioning.
    • Handling: Unlike the longer Omni models (15mm and up) that feature a rubberized grip, the 12mm has a smaller, all-metal body. Its compact size and 51.5 g weight, however, make it extremely easy to handle and store.

  • Is the Omni 12mm a good eyepiece for planetary viewing?

    Yes, the 12mm focal length provides medium-high magnification in most telescopes, making it ideal for observing details on planets like Jupiter, Saturn, and Mars. The 4-element Plössl design and multi-coatings of the Omni 12mm ensure sharp, high-contrast views necessary for resolving fine surface features.

    How will the Celestron Omni 12mm perform on globular clusters like the Hercules Cluster (M13)?

    In a telescope like an 8" f/10 SCT, the Omni 12mm eyepiece will provide enough magnification to begin resolving the dense core of M13 into individual stars. The 50° field of view is wide enough to frame the cluster against a dark sky background, and the blackened lens edges enhance the contrast, making the faint outer stars pop.

    Can I use the Omni 12mm eyepiece with eyeglasses?

    With only 8mm of eye relief, the Omni 12mm is not recommended for eyeglass wearers. To see the entire 50° field of view, your eye needs to be very close to the lens, which is difficult or impossible with glasses on. Observers who require glasses for astigmatism should look for eyepieces with at least 15mm of eye relief.

    What does a Plössl eyepiece like the Omni 12mm do well?

    A Plössl is an excellent all-around eyepiece design known for sharp, high-contrast views and a flat field of view. They are particularly effective for lunar, planetary, and double-star observing where sharpness and contrast are paramount. The simple 4-element design also results in high light transmission.

    Can I use filters with the Celestron Omni 12mm eyepiece?

    Yes. The 1.25" barrel of the Omni 12mm is threaded to accept all standard 1.25" astronomical filters. This allows you to use color filters for planetary observing, a moon filter to reduce glare, or light pollution filters for deep-sky objects.

    What is the difference between the Omni 12mm and the Omni 15mm?

    The primary differences are magnification and eye relief. The 12mm provides higher magnification than the 15mm. However, the 15mm Omni offers longer eye relief, making it more comfortable to use, especially for eyeglass wearers. The 15mm model also includes a rubberized grip, which the 12mm does not have.

  • Eyepiece Type Plössl
    Focal Length 12mm (0.49")
    Barrel Size 1.25" (32mm)
    Apparent Field of View 50°
    Optical Design 4 elements, 2 groups
    Optical Coatings Multi-Coated
    Eye Relief 8mm (0.31")
    Field Stop Diameter 10.7mm (0.42")
    Filter Threads Yes (1.25")
    Parfocal No
    Eye Guard Yes, Fold-down rubber
    Body Material Aluminum
    Dimensions 47.3mm x 34mm x 34mm
    Weight 1.81 oz (51.5 g)
    Waterproof No
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