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Celestron SkyMaster 25x100 Binoculars
Celestron SkyMaster 25x100 Binoculars
Celestron SkyMaster 25x100 Binoculars
Celestron SkyMaster 25x100 Binoculars
Celestron SkyMaster 25x100 Binoculars
Celestron SkyMaster 25x100 Binoculars
Celestron SkyMaster 25x100 Binoculars

Celestron SkyMaster 25x100 Binoculars

by Celestron
SKU CEL-71017
$519.95 - $519.95
$519.95
$519.95 - $519.95
$519.95
Price Match Policy!
  • 25x magnification for detailed celestial and terrestrial views
  • Massive 100mm objective lenses for superior light-gathering
  • High-quality BaK-4 Porro prisms
  • Multi-coated optics for bright, high-contrast images
  • Integrated tripod adapter for stable, long-duration viewing
  • 15mm eye relief for comfortable viewing
1 in stock
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Celestron SkyMaster 25x100mm Porro Binoculars

    The Celestron SkyMaster 25x100mm Porro Binoculars combine massive 100mm objective lenses with 25x magnification to deliver the light-gathering power required for serious astronomical viewing. With a twilight factor of 50 and the ability to resolve stars down to a limiting magnitude of 12.50 under ideal conditions, these binoculars pull in faint deep-sky objects far beyond the reach of smaller optics. The large 4mm exit pupil and multi-coated BaK-4 prisms ensure the collected light translates into bright, high-contrast images, whether you are scanning the Milky Way or observing a distant ship on the horizon.

    100mm Objectives and 25x Magnification for Deep-Sky Viewing

    The core of the SkyMaster 25x100's capability lies in its giant 100mm objective lenses, designed for maximum light collection. This aperture allows you to resolve globular clusters, identify the faint spiral arms of galaxies, and split binary stars that are invisible in standard binoculars. The fixed 25x magnification provides the power necessary to reveal details on the Moon's surface and clearly see the moons of Jupiter, while the 3° angular field of view is still wide enough to frame entire open clusters like the Pleiades (M45).

    • BaK-4 Prisms: Utilizes high-quality BaK-4 prism glass to minimize internal light loss and produce sharp images with excellent color fidelity across the entire field.
    • Multi-Coated Optics: Enhances light transmission for brighter views and increased contrast, which is critical for discerning faint nebulosity against the dark sky background.
    • High Twilight Factor: A twilight factor of 50 indicates exceptional performance in low-light conditions, making these binoculars ideal for astronomy at dusk and dawn.

    A 140 oz Design with Integrated Tripod Support

    At a substantial 140 oz (3969 g), the SkyMaster 25x100 is built for stability, not handheld use. Celestron has engineered the binocular body with enhanced structural reinforcement to maintain precise optical alignment of the large prisms and lenses. An integral, super-rigid tripod adapter is built directly into the central support shaft, providing a secure connection point essential for preventing image shake during extended viewing sessions.

    • Integrated Adapter: Eliminates the need for a separate L-bracket, ensuring a stable, vibration-free platform for high-magnification viewing. A sturdy tripod is mandatory.
    • Observer Comfort: The 15mm of eye relief allows for comfortable viewing, and the interpupillary distance can be adjusted from 56mm to 72mm to fit a wide range of users.
    • Diopter Adjustment: A ±5 diopter range on the right eyepiece allows you to compensate for differences in focus between your eyes, achieving a perfectly sharp image.

    Dual-Purpose Astronomy and Long-Distance Terrestrial Observation

    While designed with the heavens in mind, the SkyMaster 25x100 is a powerful tool for extreme long-distance terrestrial viewing. The same light-gathering and magnification that excel at astronomy provide incredibly detailed views of distant landscapes, wildlife, or objects on the water. The 156 ft linear field of view at 1000 yards allows you to scan wide areas for targets of interest before focusing in on details.

    • Astronomical Use: Ideal for sweeping the star-rich fields of Sagittarius, tracking comets, or getting wide-field views of the Andromeda Galaxy (M31) and the Orion Nebula (M42).
    • Terrestrial Use: Perfect for coastal observation, mountain vistas, or any scenario where you need to resolve fine details at distances of a mile or more. Note the 80 ft close focus distance makes them unsuitable for nearby subjects.

    SkyMaster 25x100 vs. 25x70: The Aperture Advantage

    A common decision for buyers is choosing between the 25x100 and the more portable 25x70 SkyMaster model. While both offer the same 25x magnification, the difference in light-gathering is significant.

    • Light Gathering: The 100mm objectives have roughly twice the light-gathering area of the 70mm objectives. This directly translates to a brighter image and the ability to see fainter objects. Under dark skies, the 25x100 can reveal objects that remain completely invisible in the 25x70.
    • Weight and Portability: The primary trade-off is size. The 25x100 weighs 140 oz, while the 25x70 is considerably lighter. If portability is your main concern, the 25x70 is the better choice. However, for a semi-permanent setup or when maximum performance is the goal, the 25x100 is the clear winner.
    • Resolution: The larger aperture of the 25x100 also provides higher potential resolution, allowing for tighter star images and the ability to discern more detail in objects like globular clusters.

  • Are the SkyMaster 25x100mm binoculars too heavy to use without a tripod?

    Yes, absolutely. At 140 oz (nearly 9 pounds), these binoculars are impossible to hold steady by hand. A robust, sturdy tripod is not just recommended; it is essential for using the SkyMaster 25x100mm. They include an integrated tripod adapter for this purpose.

    How do the SkyMaster 25x100mm binoculars perform on planets like Jupiter or Saturn?

    With 25x magnification, you can easily see Jupiter's four Galilean moons and may be able to discern its two main equatorial belts as faint lines. You will be able to see that Saturn has rings, but you will not be able to resolve details like the Cassini Division. These binoculars are primarily designed for wide-field deep-sky viewing, not high-power planetary observation.

    What does the 4mm exit pupil on the SkyMaster 25x100mm mean for astronomical viewing?

    An exit pupil of 4mm is a good compromise for astronomical viewing. It's large enough to provide a bright image in moderately light-polluted skies but not so large that it wastes light for observers whose pupils don't dilate to 6-7mm in the dark. This makes the background sky appear darker and can increase the contrast on faint nebulae.

    Are these SkyMaster 25x100mm binoculars waterproof?

    They are "Water Resistant," meaning they can handle light rain or dew, but they are not nitrogen-purged or O-ring sealed, so they are not fully waterproof or fog-proof. They should not be submerged or exposed to heavy, sustained downpours.

    Can I use filters with the SkyMaster 25x100mm binoculars?

    Standard binocular models like the SkyMaster 25x100mm do not have threaded eyepieces to accept standard 1.25" or 2" astronomical filters. You would need to use a filter that could be held in front of the eyepiece, which is not ideal.

    What is the advantage of BaK-4 prisms in the SkyMaster 25x100?

    BaK-4 (Barium Crown) glass is a higher-quality optical glass than the BK7 alternative often found in less expensive binoculars. It has a higher refractive index, which results in a perfectly round exit pupil. This minimizes vignetting (dimming at the edges of the field) and ensures a brighter, sharper image across the entire 3° field of view.

  • Magnification 25x
    Objective Lens Diameter 100mm (3.94")
    Angular Field of View 3°
    Linear Field of View 156 ft @ 1000 yds (52 m @ 1000 m)
    Exit Pupil 4mm
    Eye Relief 15mm
    Close Focus 80 ft (24.4 m)
    Interpupillary Distance 56mm - 72mm
    Diopter Adjustment ±5
    Prism Glass BaK-4
    Lens Coatings Multi-Coated
    Twilight Factor 50
    Relative Brightness 16
    Limiting Stellar Magnitude 12.50 (Ideal)
    Weight 140 oz (3969 g)
    Dimensions 256mm x 130mm x 388mm
    Tripod Adaptable Yes (Integrated)
    Environmental Protection Water Resistant
    Nitrogen Filled No

    • Objective Lens Caps

      × 1 pair

    • Rainguard

      × 1

    • Nylon Carrying Case

      × 1

    • Neck Strap

      × 1

    • Lens Cloth

      × 1

    • Instruction Manual

      × 1

  • Celestron Limited Lifetime Warranty

    Solar Warning: Never look directly at the Sun with the naked eye or with this optic. Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.