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Lunt 60° 12mm Flat-Field Eyepiece - 1.25"
Lunt 60° 12mm Flat-Field Eyepiece - 1.25"
Lunt 60° 12mm Flat-Field Eyepiece - 1.25"

Lunt 60° 12mm Flat-Field Eyepiece - 1.25"

by Lunt Solar Systems
SKU LSS-LS12E
CA$125.00 - CA$125.00
CA$125.00
CA$125.00 - CA$125.00
CA$125.00
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  • 12mm Focal Length
  • 60° Apparent Field of View
  • Flat-Field Optical Design
  • Etalon-Grade Anti-Reflective Coatings
  • 1.25" Barrel Diameter
2 in stock
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  • Description
  • FAQ
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  • In the Box
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  • Lunt 60° 12mm Flat-Field Eyepiece - 1.25"

    The Lunt 60° 12mm Flat-Field Eyepiece is engineered for a single purpose: delivering the highest possible contrast for solar observation. This 1.25" eyepiece combines a versatile 12mm focal length with an immersive 60° apparent field of view. Its optical system is distinguished by the same etalon-grade, low-reflectivity coatings used on Lunt's primary solar filters, ensuring internal reflections are suppressed for a dark, detailed view of the Sun.

    A 60° Flat Field at 12mm: Edge-to-Edge Solar Views

    The 12mm focal length provides a significant increase in magnification over standard Kellner or Plössl eyepieces included with many solar telescopes, resolving fine granulation and intricate details within active regions. The flat-field design corrects for field curvature, keeping the Sun's limb as sharp as the center of the disk. This allows the immersive 60° apparent field to be fully utilized, ensuring prominences and filaments remain in focus across your entire view.

    1.25" Design with Etalon-Grade Coatings for Maximum Contrast

    In solar observing, contrast is everything. Faint chromospheric and photospheric details are easily lost to internal glare. The Lunt 12mm eyepiece uses the same specialized anti-reflective coatings applied to their internal etalons, minimizing reflections that can wash out subtle features. This specialized design, housed in a standard 1.25" barrel, makes it a critical upgrade for any dedicated solar observer seeking to extract the maximum detail from their H-alpha or white-light telescope.

  • Why are the coatings on the Lunt 12mm eyepiece important for solar observing?

    Standard eyepieces are designed for nighttime use against a black background, where minor reflections are often invisible. Against the intensely bright solar disk, these same reflections create significant glare, reducing contrast. The Lunt 12mm eyepiece uses specialized, etalon-grade coatings designed to suppress these reflections, preserving the faint details in solar prominences, filaments, and surface granulation.

    How will the Lunt 12mm Flat-Field eyepiece perform on solar prominences in a Lunt LS50THa telescope?

    In a Lunt LS50THa (350mm focal length), the 12mm eyepiece yields approximately 29x magnification. This is an excellent power for viewing the entire solar disk while having enough image scale to resolve the structure within large prominences on the Sun's limb. The flat-field design ensures that these prominences remain sharp even at the edge of the 60° field of view.

    What does "flat-field" mean for the Lunt 60° 12mm eyepiece?

    A flat-field design means the eyepiece corrects for optical aberrations that can make stars or details at the edge of the view appear out of focus when the center is sharp. For solar viewing, this is critical because it ensures the edge of the Sun (the limb) and any prominences there are just as crisp as the details in the center of the disk, providing a sharp image across the entire 60° field.

    Can I use the Lunt 12mm eyepiece for nighttime observing?

    While you can use it at night, it is highly optimized for solar work. The aggressive anti-reflection coatings are tuned for performance in daylight against a bright source. For general nighttime use, a premium multi-purpose eyepiece may provide better color fidelity on faint deep-sky objects. However, for bright targets like the Moon and planets, it will still perform well.

    What magnification will the Lunt 12mm eyepiece give me on a telescope with a 400mm focal length?

    To find the magnification, you divide the telescope's focal length by the eyepiece's focal length. For a telescope with a 400mm focal length, the Lunt 12mm eyepiece will provide: 400mm / 12mm = 33.3x magnification. This is a typical focal length for a 60mm solar telescope, providing excellent full-disk views with enhanced detail.

    Is the 60° apparent field of the Lunt 12mm eyepiece wide enough for the full solar disk?

    Yes, in most dedicated solar telescopes. The Sun has an angular size of about 0.5 degrees. The true field of view with this eyepiece in a typical 400mm focal length solar scope is about 1.8 degrees, which is more than three times the diameter of the Sun. This provides a comfortable view of the entire solar disk with plenty of surrounding black space.

  • SKU LS12E

  • This product includes the eyepiece only. Dust caps may be included by the manufacturer but are not guaranteed.

  • Lunt Solar Systems 5-Year Warranty