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SVBONY Plossl Metal FMC Eyepiece 25mm 1.25inch
SVBONY 25mm Plössl Metal FMC Eyepiece - 1.25"
SVBONY Plossl Metal FMC Eyepiece 25mm 1.25inch

SVBONY 25mm Plössl Metal FMC Eyepiece - 1.25"

by SVBONY
SKU SV-F9149A
CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
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  • 25mm Focal Length
  • 40° Apparent Field of View
  • 1.25" Diameter Barrel
  • Fully Multi-Coated (FMC) Optics
  • 4-Element Plossl Design
  • Standard M28.5*0.6 Filter Threads
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY Plossl Metal FMC Eyepiece 25mm 1.25inch

    The SVBONY Plossl Metal FMC Eyepiece delivers a classic moderate-power view with its 25mm focal length and 4-element optical design. Its 40-degree apparent field of view fits comfortably in any standard 1.25" focuser, providing sharp, high-contrast images of the moon, planets, and brighter deep-sky objects.

    A Classic General-Purpose Optic: The 25mm, 40° View

    With a 25mm focal length, this eyepiece provides low-to-moderate magnification that is ideal for locating objects and observing larger star clusters and nebulae. The 40-degree apparent field of view is a hallmark of the Plossl design, offering a sharp, well-corrected image across the entire field, a noticeable improvement over simpler 2- or 3-element eyepieces.

    This combination makes the 25mm Plossl a workhorse for any telescope. It's an excellent choice for viewing the entire lunar disc, tracking Jupiter and its moons, or framing open clusters like the Pleiades (M45) within a rich, dark background.

    Maximizing Contrast: 4 Elements with FMC Coatings

    This eyepiece's optical system consists of a 4-element design arranged in 2 groups, a configuration known for producing high-contrast views with minimal internal reflections. To further enhance this, all air-to-glass surfaces are fully multi-coated (FMC), increasing light transmission for brighter images. The lens edges are also blackened to absorb stray light that can reduce contrast and wash out faint details.

    • Fully Multi-Coated Lenses: Reduces light loss, resulting in brighter views of faint objects like the Orion Nebula (M42) compared to single-coated or uncoated optics.
    • Blackened Lens Edges: Improves contrast by preventing off-axis light from scattering within the eyepiece, making it easier to see fine details on planetary surfaces.
    • Rubber Eye Guard: Blocks ambient light and allows you to comfortably position your eye for a stable view. The 79g weight ensures it won't create balance issues on smaller telescopes.

    SVBONY 25mm Plossl vs. Standard Kit Eyepieces

    Many beginner telescopes are supplied with basic Kellner or Huygens eyepieces. The SVBONY 25mm Plossl represents a significant and affordable upgrade over these stock accessories. The primary differences lie in the optical design and coatings.

    The Plossl's 4-element design provides superior correction for optical aberrations compared to 3-element Kellners, resulting in sharper stars at the edge of the field. Furthermore, the Fully Multi-Coated optics transmit significantly more light, making every object appear brighter and more detailed. For a small investment, this eyepiece can dramatically improve the views from your existing telescope.

  • What views can I expect with the SVBONY 25mm Plossl in an 8" f/10 SCT?

    In a typical 8" f/10 Schmidt-Cassegrain Telescope (SCT) with a 2032mm focal length, the SVBONY 25mm Plossl will provide 81x magnification. This is an excellent magnification for viewing globular clusters like the Hercules Cluster (M13), resolving planetary details on Jupiter and Saturn, and observing medium-sized galaxies.

    How does the SVBONY 25mm Plossl perform on the Andromeda Galaxy (M31) in a small refractor?

    In a short focal length refractor, like a 72mm f/6, this eyepiece will yield low power (around 17x). This provides a wide true field of view, perfect for framing large objects. You'll be able to see the bright core of the Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 all in the same field.

    Is the 40-degree field of view of the SVBONY 25mm Plossl a limitation?

    While the 40-degree apparent field is narrower than more expensive wide-field eyepieces, it is a deliberate trade-off of the Plossl design. This focus allows for excellent sharpness, high contrast, and good control of optical aberrations with only 4 lens elements. It provides a clean, classic "porthole" view into space that many observers appreciate.

    Why choose a prime eyepiece like the SVBONY 25mm Plossl over a zoom eyepiece?

    A prime (fixed focal length) eyepiece like this 25mm Plossl generally offers better optical quality for the price than a zoom eyepiece. With fewer moving parts and a simpler optical path, it typically delivers sharper, higher-contrast images. While a zoom offers convenience, a good quality Plossl often provides a superior viewing experience at its specific magnification.

    Are the threads on the SVBONY 25mm Plossl compatible with standard filters?

    Yes. The eyepiece features standard M28.5*0.6 threads on the inside of the 1.25" barrel. This allows you to attach any standard 1.25" astronomical filter, such as a Moon filter for lunar observing or a light pollution filter for enhancing deep-sky objects.

    What makes the SVBONY 25mm Plossl a good "first upgrade" eyepiece?

    It's an ideal first upgrade because it offers a noticeable improvement in brightness, contrast, and sharpness over the basic eyepieces included with most beginner telescopes, without a high cost. Its 25mm focal length is extremely versatile, making it useful for nearly any type of celestial object.

  • Eyepiece Type Plossl
    Lens Design 4 Elements in 2 Groups
    Focal Length 25mm
    Barrel Size 1.25"
    Apparent Field of View 40°
    Lens Coating Fully Multi-Coated (FMC)
    Filter Threads M28.5*0.6 (Standard 1.25")
    Blackened Lens Edges Yes
    Rubber Eye Guard Yes
    Height 72mm / 2.82in
    Net Weight 79g / 2.8oz

    • SVBONY Plossl 25mm Eyepiece

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  • SVBONY 1-Year Warranty