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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

  • Product typeBinoculars
  • Product 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.

How it compares

Measured against everything we stock in Binoculars, Scopes & Sights, at today’s prices. Recalculated every night.

Price $371.99
Pricier than about 76% of the 1,401 comparable items (median $93.99).

Specifications

Product
Brand nameCELESTRON
Product typeBinoculars
Product 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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