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 Ultima Edge 70° 30mm - 2"
Celestron Ultima Edge 70° 30mm - 2"
Celestron Ultima Edge 70° 30mm - 2"

Celestron Ultima Edge 70° 30mm - 2"

by Celestron
SKU CEL-93454
$299.95 - $299.95
$299.95
$299.95 - $299.95
$299.95
Price Match Policy!
  • 30mm focal length provides low-power, wide true-field views
  • 70° apparent field of view frames large celestial objects
  • Flat-field optical design ensures sharp stars from center to edge
  • 22mm of eye relief offers comfortable viewing for eyeglass wearers
  • 9-element, 5-group optics are fully multi-coated for maximum light transmission
  • Standard 2" barrel is threaded for filters
Backordered
Request Stock Alert
Availability Info
Worldwide Shipping
Visual Simulator Preview
Visual Simulator Instant FOV Preview

Preview your eyepiece FOV

Simulate the exact field of view of the Celestron Ultima Edge 70° 30mm - 2" with your specific telescope.

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

  • Celestron Ultima Edge 70° 30mm Flat Field Eyepiece - 2"

    The Celestron Ultima Edge 70° 30mm eyepiece corrects for field curvature, delivering sharp stars across its entire 70° apparent field of view. Its 9-element, 5-group optical system is fully multi-coated to maximize light transmission, while the generous 22mm of eye relief ensures viewing comfort. The 2" barrel and 30.4mm field stop are engineered to provide expansive, low-power views of deep-sky objects.

    A Flat-Field 70° View: 9 Elements for Edge-to-Edge Sharpness

    The core of the Ultima Edge 30mm is its flat-field optical design, which eliminates the distortion and field curvature common in conventional eyepieces. This complex 9-element, 5-group system ensures that stars remain tight, pinpoint sources of light from the center of the view right to the 30.4mm field stop. The result is an immersive 70° field that feels sharp and consistent across its entire expanse, allowing you to appreciate star clusters and nebulae without distracting aberrations at the periphery.

    Maximum True Field: The 30mm Advantage for Deep-Sky Objects

    With its 30mm focal length, this eyepiece is designed to deliver your telescope's widest possible true field of view in a 2" format. This low-power magnification is ideal for framing large deep-sky targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety. It also serves as an excellent "finder" eyepiece, making it easier to locate targets before switching to higher magnifications.

    Observer-Focused Design: 22mm Eye Relief and 2" Filter Threads

    Comfort is critical during long observing sessions, and the Ultima Edge 30mm provides a generous 22mm of eye relief. This allows eyeglass wearers to see the entire 70° field of view without removing their glasses. The machined aluminum body features a non-slip rubber grip for secure handling, and the 2" barrel is threaded to accept standard 2" nebula and light pollution filters, a crucial feature for enhancing contrast on faint deep-sky objects.

    Practical Considerations: Weight, Balance, and Focusing

    Weighing in at 674.7 g (23.8 oz), the Ultima Edge 30mm is a substantial eyepiece that requires proper counterbalancing, especially on smaller mounts. Its robust construction contributes to its optical stability. This eyepiece is not parfocal, meaning you will need to readjust focus when swapping it with other eyepieces in your collection, a minor trade-off for its edge-to-edge optical correction.

  • What is a "flat-field" eyepiece and why does it matter for the Ultima Edge 30mm?

    A flat-field eyepiece, like the Ultima Edge 30mm, uses a complex optical design with 9 lens elements to correct for field curvature. This means stars at the edge of the 70° field of view appear as sharp pinpoints, not stretched or blurred, providing a more natural and immersive view of star fields and large objects like the Pleiades (M45).

    Is the Ultima Edge 30mm good for viewing planets?

    While designed for wide-field, deep-sky views, the Ultima Edge 30mm can be used for planets. However, its low magnification is not ideal for resolving fine detail on Jupiter or Saturn. Its primary strength lies in framing large objects, not high-magnification planetary observation.

    How will the Ultima Edge 30mm perform in my 8" f/10 Schmidt-Cassegrain?

    In a typical 8" (2032mm focal length) SCT, the Ultima Edge 30mm eyepiece will provide a magnification of 68x and a true field of view of about 1 degree—twice the width of the full Moon. This is an excellent combination for sweeping the Milky Way and observing large open clusters like the Beehive Cluster (M44).

    Can I use filters with the Ultima Edge 30mm eyepiece?

    Yes. The 2" (50.8mm) barrel is internally threaded to accept standard 2" astronomy filters. This is especially useful for threading in a UHC or OIII filter to enhance the contrast of emission nebulae like the Orion Nebula (M42).

    Is the 22mm eye relief on the Ultima Edge 30mm suitable for eyeglass wearers?

    Absolutely. The 22mm of eye relief is considered very long and provides ample space between the eyepiece lens and your eye. This allows observers who wear glasses for astigmatism to see the entire 70° field of view comfortably without vignetting.

    The Ultima Edge 30mm is listed as not parfocal. What does this mean for observing?

    "Not parfocal" means that if you switch from this eyepiece to another one, you will have to significantly adjust your telescope's focuser to get a sharp image again. It's a minor operational step to be aware of when planning your observing sequence.

  • Focal Length 30mm (1.18")
    Apparent Field of View 70°
    Barrel Size 2" (50.8mm)
    Eye Relief 22mm (.87")
    Optical Design Wide-field Flat
    Lens Elements 9
    Lens Groups 5
    Optical Coatings Fully Multi-Coated
    Field Stop Diameter 30.4mm (1.2")
    Parfocal No
    Filter Threads Yes (2")
    Eye Guard Yes, Fold Down
    Body Material Aluminum
    Waterproof No
    Dimensions 116mm x 60mm x 60mm (4.57" x 2.36" x 2.36")
    Weight 23.8 oz (674.7 g)
    • Celestron Ultima Edge 30mm Eyepiece

      Ultima Edge 30mm Eyepiece

      × 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