Celestron Skymaster 20x80 Binoculars

  (2 Reviews)
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About this product

Model:  cel_skymstr_20x80_71018
Part Number:  71018-CGL

Celestron's SkyMaster Series of large aperture binoculars are a phenomenal value for high performance binoculars. Ideal for astronomical viewing or for terrestrial (land) use, especially over long distances. SkyMaster models feature high quality BaK-4 prisms and multi-coated optics for enhanced contrast. Celestron has designed and engineered the larger SkyMaster models to meet the special demands of extended astronomical or terrestrial viewing sessions.

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  • 20x magnification porro prism binocular
  • Giant 80 mm objective lens offers maximum image brightness in low-light and long-range conditions
  • Ultra sharp focus across the field of view
  • Multi-Coated optics for sharp, clear views
  • Suitable for terrestrial or astronomical viewing
  • Protective rubber covering for ultra-firm grip
  • Large center focus knob for easy focusing
  • Integrated tripod adapter rod for ultra-stable tripod mounting
  • Long eye relief ideal for eyeglass wearers
  • Soft carrying case included for travel and safe storage
  • Limited Lifetime Warranty provides best protection and product support on the market

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What's in the box

  • Skymaster Binoculars
  • Objective Lens Caps
  • Rainguard
  • Carry Case
  • Neck Strap
  • Lens Cloth
  • Instruction Manual


Objective Lens Diameter (mm)80 mm
Magnification (x)20x
Angular Field of View3.7°
Exit Pupil (mm)4 mm
Eye Relief (mm)18 mm
Close Focus108 ft (33 m)
Optical CoatingsMulti-Coated
Weight (oz)75 oz (2126 g)
Prism Glass (Type)BaK-4
Twilight Factor40
Relative Brightness16
WeatherproofWater Resistant

Downloads / Manuals

Celestron Skymaster Instruction Manual (PDF)

Customer reviews

Average Rating (2 Reviews):  
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Rating (max 5):  
The best imaging device you have is the one you use.
Friday, 5 November 2021  | 

I came home after a difficult day to find the binoculars. Mercifully my wife was out.

Very bulky. Not too heavy but they need to go on a tripod. Chromatic aberration is noticeable but the thing is I could have dragged out loads of stuff and cables computers and whatever for a rather better view but I went for these to avoid the hassle.

If Leica or Swarovski sell this kind of binoculars and you have the money then buy them instead. Otherwise I think a very good choice.

Rating (max 5):  
Good all round binos
Thursday, 3 May 2018  | 

Being a fairly casual observer, but having some nice views from our attic room, I fancied getting some binos that I could use both terrestrially and astronomically. I wanted something with a bit of power (I already have a set of 10X50s) and with big lenses for light grabbing. The Celestron's were attractive at the price so I gave them a whirl.

These are big, but solidly made, with a nice rubber finish which gives a good grip. A tripod is clearly going to be needed for anything other than a quick glance around, but they sit pretty well on my medium-duty tripod using the inbuilt, and adjustable tripod adapter - I just screwed in a quick-release plate for my tripod with a standard sized screw and away we went. Adjustment is easy and the bracket allows for adjustment of position as well as the tripod.

Views during the day are fantastic and clear and give a nice crisp view. There is some CA on brighter objects, but not enough to upset me. I have not had much chance to use them for astronomy, although views of the moon are again crisp and clear. CA can be more of a problem at night and a couple of times it was quite bad on a bright full moon - I am not sure if this is the same for all models in this range, or if I need to set them up better, as I have read other reviews that don't see it as a problem, but it is worth noting. I think careful set-up and patience will be required at night, but I was still able to get a decent view of Jupiter's disc and moons, despite it rising next to a full moon a couple of nights ago.

Weight-wise, they are not as heavy as I imagined but, again, you will need something to mount them on as your arms will get tired very quickly - once focused it is easier to hold them closer to the objective lenses and let the eye-cup rest against your eyes but, again, you won't be doing that for long periods.

The supplied bag and strap are simple, but fine for basic use - if you are planning on taking them out and about a lot, then you might want to invest in a more solid strap and a hard case.

As a "starter" set for casual viewing, I think these are a great buy. If you are more "serious" user and want something devoid of CA, then you will need something a lot more expensive - for the price, the Celestrons give a pretty decent bang for the buck.


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Q1. How much do these binoculars weigh?

The Celestron Skymaster 20x80 binoculars weigh 2,126g / 75oz.

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