Skip to content
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Lunt 53° 27mm Flat-Field Eyepiece - 1.25"
Lunt 53° 27mm Flat-Field Eyepiece - 1.25"
Lunt 53° 27mm Flat-Field Eyepiece - 1.25"

Lunt 53° 27mm Flat-Field Eyepiece - 1.25"

by Lunt Solar Systems
SKU LSS-LS27E
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
Price Match Policy!
  • 27mm Focal Length
  • 53° Apparent Field of View
  • 1.25" Barrel Size
  • Flat-Field Optical Design
2 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
Visual Simulator Preview
Visual Simulator Instant FOV Preview

Preview your eyepiece's FOV

Simulate the exact field of view of the Lunt 53° 27mm Flat-Field Eyepiece - 1.25" with your specific telescope.

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

  • Lunt 53° 27mm Flat-Field Eyepiece - 1.25"

    The Lunt 27mm Flat-Field Eyepiece presents a moderately wide 53° apparent field of view in a standard 1.25" barrel, serving as an excellent low-power utility eyepiece. Its 27mm focal length provides expansive true fields of view ideal for locating objects, while the flat-field optical design ensures stars remain sharp across the entire 53° frame.

    A Flat Field in a 53° Apparent View

    This eyepiece's primary design goal is to correct for field curvature, an aberration that softens stars at the edge of the field, especially in fast telescopes. The flat-field correction renders point-like stars from the center to the edge, making the entire 53° apparent field fully usable and pleasing to observe.

    While the 53° field is not an ultra-wide "spacewalk" view, it offers a comfortable and natural window on the sky that is easy for the eye to take in at once. This makes it a practical choice for scanning the Milky Way or observing open clusters where edge-to-edge sharpness is more critical than an immersive feel.

    27mm Focal Length in a 1.25" Barrel: The Ideal Finder Eyepiece

    With a 27mm focal length, this eyepiece will be among the lowest magnifications in any 1.25" eyepiece collection. This low power translates directly into a wider true field of view, simplifying the task of sweeping for faint galaxies or centering large objects like the Andromeda Galaxy (M31) or the Pleiades (M45).

    Its function as a "finder" eyepiece is invaluable, especially for telescopes without a GoTo system. The standard 1.25" barrel ensures universal compatibility with the focusers and diagonals on virtually any refractor, reflector, or catadioptric telescope.

  • What is the main advantage of the Lunt 27mm Flat-Field eyepiece's design?

    The main advantage is its flat-field correction. This optical design minimizes field curvature and astigmatism at the edge of the view, ensuring that stars remain sharp, point-like objects across the entire 53° apparent field, which is especially beneficial in faster focal ratio telescopes.

    How will the Lunt 27mm eyepiece perform on the Pleiades (M45) in a short f/5 refractor?

    It would perform exceptionally well. The 27mm focal length will provide a wide true field of view, perfect for framing the entire Pleiades star cluster (M45). In a fast f/5 refractor, the flat-field design is critical, as it will correct for the significant field curvature inherent in such systems, keeping all the member stars of the cluster sharp.

    Is the Lunt 27mm a good eyepiece for high-power planetary viewing?

    No, this is a low-power eyepiece designed for wide-field views. For high-power observation of planets like Jupiter or Saturn, you would need an eyepiece with a much shorter focal length, typically in the 4mm to 9mm range, to achieve the necessary magnification.

    Would the Lunt 27mm eyepiece be a good choice for finding objects with an 8" f/10 SCT?

    Yes, it's an excellent choice. An 8" f/10 Schmidt-Cassegrain has a long focal length, making its field of view inherently narrow. The Lunt 27mm eyepiece will provide the lowest practical magnification and the widest possible true field of view, making it much easier to locate your targets before switching to a higher-power eyepiece for detailed observation.

    What does the 53° apparent field of view on the Lunt 27mm eyepiece feel like?

    A 53° apparent field provides a comfortable, natural window on the sky. It is noticeably wider than a traditional 40°-45° Plössl but not as vast as an 82° or 100° ultra-wide eyepiece. It offers a great balance between a wide-field experience and observing comfort, without requiring you to move your eye around to see the edges.

    Will the Lunt 27mm Flat-Field eyepiece work with my telescope's 1.25" focuser?

    Yes. The Lunt 27mm eyepiece uses a 1.25" barrel, which is the most common standard for telescope focusers and diagonals. It is compatible with nearly all consumer telescopes on the market.

  • SKU LS27E
    Focal Length 27mm
    Apparent Field of View 53°
    Barrel Size 1.25"
    Optical Design Flat-Field
  • Lunt Solar Systems 5-Year Warranty