Skip to content
July 1st: Store will be closed for Canada Day. Orders placed that day will ship on July 2nd.
July 1st: Store will be closed for Canada Day. Orders placed that day will ship on July 2nd.
Celestron Luminos 23 mm - 2"
Celestron Luminos 23 mm - 2"

Celestron Luminos 23 mm - 2"

by Celestron
SKU CEL-93434
$249.95 - $249.95
$249.95
$249.95 - $249.95
$249.95
Price Match Policy!
  • 23mm Focal Length for Medium-Low Power Wide Views
  • 82° Apparent Field of View
  • 2" Barrel Diameter
  • 20mm Eye Relief for Viewing Comfort
  • 6-Element Optical Design
  • Parfocal with all Luminos Eyepieces
1 in stock
Worldwide Shipping
Visual Simulator Preview
Visual Simulator Instant FOV Preview

Preview your eyepiece FOV

Simulate the exact field of view of the Celestron Luminos 23 mm - 2" with your specific telescope.

Launch Visual Assistant
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Celestron Luminos 23mm Eyepiece - 2"

    The Celestron Luminos 23mm Eyepiece delivers an expansive 82° apparent field of view through its 2" barrel, utilizing a 6-element optical design to frame large celestial objects. With a comfortable 20mm of eye relief and a substantial 37mm field stop, this eyepiece provides immersive, wide-field views in telescopes of all types. All Luminos eyepieces are parfocal, meaning you can switch from this 23mm model to another in the series with little to no refocusing required.

    An Immersive 82° Field of View

    With an apparent field of view of 82°, the Luminos 23mm creates a "spacewalk" experience, where the edge of the eyepiece seems to disappear. This ultra-wide perspective is ideal for framing large deep-sky objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31) in their entirety, providing context that narrower eyepieces cannot. The 23mm focal length provides a versatile medium-low magnification, perfect for scanning the Milky Way's star fields or locating your next target.

    6-Element, Fully Multi-Coated Optics

    The internal 6-element, 4-group optical design is engineered to maintain sharp star points across the wide 82° field, especially in moderate to long focal ratio telescopes. Every air-to-glass surface is fully multi-coated, which maximizes light transmission and minimizes internal reflections. This results in brighter images and higher contrast, allowing you to discern faint details in galactic dust lanes or planetary cloud bands.

    20mm Eye Relief and Parfocal Engineering

    The Luminos 23mm features a generous 20mm of eye relief, allowing most eyeglass wearers to see the full field of view without removing their glasses. An integrated pop-up eyeguard, adjustable with a simple twist of the rubber grip, helps you find the perfect eye position and blocks stray light. As a parfocal eyepiece, it is designed to maintain focus when swapped with other Luminos models, a critical time-saver during observing sessions that eliminates the need for constant refocusing.

    • Secure Grip: A tactile rubber grip runs around the equator of the polished aluminum body, ensuring secure handling even with gloves on.
    • Filter Ready: The 2" insert barrel is threaded to accept standard 2" astronomy filters for enhancing views of nebulae or reducing light pollution.
    • Solid Build: The machined aluminum body gives the eyepiece a solid feel, weighing in at 28.24oz (800.5g).

  • Is the Luminos 23mm eyepiece good for planetary viewing?

    While the Luminos 23mm's strength is its wide field for deep-sky objects, it can provide excellent low-power views of planets, showing them within the context of their surrounding moons. For high-magnification planetary detail, you would typically use a shorter focal length eyepiece. However, the 23mm is perfect for initially locating planets and enjoying a wider perspective.

    How does the Luminos 23mm perform on the Andromeda Galaxy (M31) in an 8" f/10 SCT?

    In a typical 8" f/10 SCT with a 2032mm focal length, the Luminos 23mm yields about 88x magnification. This is an excellent magnification for framing the entirety of the Andromeda Galaxy's bright core and its surrounding dust lanes. The 82° field of view will be wide enough to comfortably contain M31 and its satellite galaxies, M32 and M110, in a single, immersive view.

    Is the 20mm eye relief on the Luminos 23mm sufficient for eyeglass wearers?

    Yes, 20mm of eye relief is considered very generous and is sufficient for most observers who wear glasses for astigmatism or other corrections. You should be able to see the entire 82° field of view comfortably. The pop-up eyeguard can be kept down to accommodate your glasses.

    What does it mean that the Luminos 23mm is "parfocal"?

    Parfocal means that this eyepiece will remain in focus when you switch it with any other eyepiece in the Celestron Luminos series. This is a significant convenience, as it saves you from having to make major adjustments to the focuser each time you change magnification, streamlining your observing session.

    Will the weight of the Luminos 23mm (28.24oz) require me to rebalance my telescope?

    At over 1.7 pounds (800.5g), the Luminos 23mm is a substantial eyepiece. When switching from a much lighter 1.25" eyepiece, you will almost certainly need to rebalance your telescope, especially on German Equatorial Mounts or Dobsonian telescopes with sensitive balance points. It's good practice to check your balance after any major change in accessories.

    Can I use 2" filters with the Luminos 23mm eyepiece?

    Yes, the 2" barrel of the Luminos 23mm is threaded to accept standard 2" filters. This allows you to easily attach light pollution, nebula, or color filters to enhance your views of various celestial objects.

  • Focal Length 23mm (0.91")
    Barrel Size 2" (50.8mm)
    Apparent Field of View 82°
    Optical Design 6 elements, 4 groups
    Optical Coatings Fully Multi-Coated
    Eye Relief 20mm (0.79")
    Field Stop Diameter 37mm (1.46")
    Parfocal Yes, with Luminos series
    Filter Threads Yes (2")
    Eye Guard Yes, Retractable Pop-up
    Body Material Aluminum
    Waterproof No
    Weight 28.24oz (800.5g)
    Dimensions 110.5mm x 80.5mm x 80.5mm (4.35" x 3.17" x 3.17")

    • Celestron Luminos 23mm Eyepiece - 2"

      × 1

    • Lens Cap (Top)

      × 1

    • Barrel Cap (Bottom)

      × 1

  • Celestron 2-Year Warranty