Celestron SkyMaster 25×100 binoculars review


Bigness is a virtue in telescopes — most of the time. The larger the light-bucket, the more photons (‘raindrops’ of light) it can collect. But big telescopic instruments are also heavier, more ungainly and can demand greater care and feeding. We’ve chosen the Celestron SkyMaster 25×100 binoculars as our top pick for large astronomy binoculars, which is why they sit in our buying guide of the best binoculars for stargazing.

SkyMaster 25×100 Key Specs:

Magnification: 25x
Objective lens diameter: 100mm
Angular field of view: 3 degrees
Eye relief: 15mm
Weight: 9 lbs, 12 oz

In the case of binoculars, serving up the universe in stereo gives you more than double the pleasure of one-eye on the sky. But servicing the demands of two eyes more than doubles the mass of the optical system. So as you scale up from the small portable ‘field glasses’ that might be great for watching, say, fast-moving race cars, to the larger apertures appropriate for resolving the majesty of the slowly revolving stars, the glass gets very heavy, very quickly.

Celestron SkyMaster 25×100: Design

  • Requires tripod to use (and possibly counter-weighted arm)
  • Solid in the hand reinforced by a metal bar down the binoculars
  • Objective lens covers are easy to lose

Celestron Skymaster 25x100 binoculars being handled on a tripod by the author

The SkyMaster 25×100 binoculars are big, large and heavy and should ideally be used with a tripod and counterweight (Image credit: Jeremy Lips & Dave Brody)

So, buying these Celestrons means also buying a tripod and maybe a counter-weighted arm. But the binoculars are ready when you do: A solid-feeling reinforced metal bar forms a keel, from the objective lens covers at the front to the bulbous prism warts towards the rear. A built-in tripod adapter slides along this spine; a knurled knob tightens the adapter down at your preferred position. And when your observing night is over, the bar makes a comfortably grip-able lifting fixture; which you’ve likely set at the natural balance point. So you can one-hand these heavy beasts into their protective case.

Originally published at www.space.com

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