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Large black Porro prism binoculars with big objective lenses

Celestron

Celestron 71017 25x100 SkyMaster Binoculars

SKU CH-XYQ5-8DD6Q

Large 100 mm aperture binoculars with 25x magnification for astronomy and long-distance terrestrial viewing

  • TypeBinoculars
  • ColorBlack
  • 25x magnification brings distant celestial objects into detailed view
  • 100 mm objective lenses gather abundant light for bright low-light images
  • BAK-4 Porro prisms with multi-coated optics deliver sharp, high-contrast visuals
  • Weather-resistant construction protects optics during outdoor astronomy sessions
  • Large aperture design excels for both stargazing and long-range terrestrial observation

25x100 SkyMaster Binoculars

The Celestron 71017 is a large-aperture Porro prism binocular built for high-power viewing. Its 25x magnification and 100 mm objective lenses gather substantial light for detailed astronomical and long-range terrestrial observation.

Suited for astronomers

Buyers who need a lightweight, hand-held instrument for casual daytime use should consider smaller models. The high magnification and large aperture make steady viewing difficult without a tripod or mount.

25x magnification with 100 mm objectives

This combination delivers a 4 mm exit pupil and a narrow field of view, so image brightness and stability depend heavily on mounting and ambient light. Verify that your observing style matches these optical parameters before purchase.

Highlights

  • 25x magnification brings distant celestial objects into detailed view
  • 100 mm objective lenses gather abundant light for bright low-light images
  • BAK-4 Porro prisms with multi-coated optics deliver sharp, high-contrast visuals
  • Weather-resistant construction protects optics during outdoor astronomy sessions
  • Large aperture design excels for both stargazing and long-range terrestrial observation

Specifications

BrandCELESTRON
TypeBinoculars
ColorBlack

Questions about this item

Should I choose the 25x100 model or a smaller SkyMaster for handheld use?

The 25x100 SkyMaster delivers 25x magnification through 100 mm objective lenses, but its size and weight make a tripod or monopod essential for steady viewing.

What does the 25x magnification actually show when I point it at the night sky?

At 25x power the Moon fills much of the field, Jupiter’s cloud bands and four Galilean moons become distinct, and brighter deep-sky objects such as the Orion Nebula reveal noticeable structure.

How does the Porro prism design affect the optical path compared with roof-prism binoculars?

The Porro prism layout uses premium BAK-4 glass and multi-coated surfaces to fold light efficiently, yielding a wide exit pupil and strong contrast for low-light astronomy.

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