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// 29.9.2023 GA4 add to cart // 29.9.2023 GA4 add to cart

Celestron Skymaster 25x100

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Celestron Skymaster 25x100 Details

At 100mm in diameter, these giant binoculars have the largest objective lenses within the Skymaster series and if you think as each of them as windows, they have the potential to capture and let in more light than any other.
So whilst these large lenses do make for a bigger and heavier instrument, they play a very important part as the extra light has permitted Celestron to use a very powerful 25x magnification and still manage to maintain a reasonably large 4mm exit pupil. This directly translates to you being able to observe a bright image of the night sky even on the darkest of nights and the extra power enables you to reach further into space and see objects that you would not have otherwise, or observe an object is more detail than you could at a lower magnification.
A downside to having such a high magnification is that your field of view is reduced and thus these may not be an ideal choice for scanning the sky or for observing a complete constellation without having to move the view about. This is where a lower powered astronomy binocular like the Skymaster 8x56 DX has the upper hand.
At 15mm, the eye relief is perfectly acceptable for most users. However should you need to wear glasses, this may present a slight problem in achieving the full field of view.
Being so large and with such a high power, it is imperative that you attach the binocular to a solid base like a tripod. The built-in tripod adapter makes this very simple to achieve.

About Celestron SkyMaster Binoculars

Award winning SkyMaster series by Celestron offers one of the best binoculars for astronomical and terrestrial viewing. Extreme power and large objective lenses offer incredible view-through with extreme detail in the most challenging light conditions. With SkyMaster binoculars, you are able to observe stars, planets, comets, galaxies and more. The smallest in the series with SkyMaster 8x56 configuration received the Space.com's 2014 Editor's award for being the best medium astronomy binocular and SkyMaster 25x100 as the best astronomy binoculars. There are also two zoom version available to be able to change magnifications without moving the position. The binoculars have Porro prism system with multi-coatings on glass surfaces (except DX models which are fully multi-coated) and are splash-proof and enclosed in rubber armoring for protection.

Basic Features

The SkyMaster binoculars are one of the most powerful binoculars on the market offering models with 15x, 20x and 25x magnifications combined with large objective lenses, from 56mm to 100mm. This configuration allows you to use them in poorest lighting conditions in the wildlife and for astronomy applications. Two of the models also offer variable magnifications, so you can get finer details without moving the position. They are made out of aluminum housing enclosed in rubber armouring for maximal protection against impacts and abrasions. The rubber armoring is also rugged to prevent any sudden slips. The pocket sized binoculars have a roof prism design to make them more compact and light, and bigger models have a Porro prism system to make them brighter. The binoculars are splash-proof, tightly sealed to not get damaged when using them in the damp areas.

Optical Properties

SkyMasters are equipped with high-quality BaK-4 prisms for better light transmission and multi-coated lenses to help not only with brightness, but also to enhance the contrast and colors. This also helps to prevent the chromatic aberration, glaring and internal reflections. The smallest pocket sized models are fully-multi coated to help provide better images since they are using less bright roof prism system. All the models offer central focusing mechanism with grippy wheel that allows you to make quick adjustments with the help of right-eye diopter. Eyecups are foldable, but offer very generous eye-relief, and you can make it perfect even for eyeglass wearers.


SkyMaster binoculars comes in case for storage and protection and binocular strap. They are also equipped with objective lens covers and eyecups covers to protect the lenses, but are not included in smaller roof prism models.

Features of Celestron SkyMaster Binoculars

  • Aluminum Housing
  • Rubber Armoring
  • Multi-coated
  • Fully Multi-coated (DX models)
  • Roof Prism (21, 25 and 32)
  • Porro Prism (only full-sized)
  • Zoom (40 and 50)
  • BaK-4 Prisms
  • Foldable Eyecups
  • Central Focusing
  • Right-eye Diopter
  • Splash-proof
  • Tripod Adaptable (only full-sized)

Accessories of Celestron SkyMaster Binoculars

  • Binocular Strap
  • Carrying Case
  • Objective Lens Covers (only full-sized)
  • Rainguards (only full-sized)
  • Lens Cleaning Cloth

Available models of Celestron SkyMaster Binoculars

SkyMaster DX 8x56

Low-light, long range binoculars

SkyMaster 12x60

Low-light, long range binoculars

SkyMaster DX 9x63

Low-light, long range binoculars

SkyMaster 15x70

Low-light, long range binoculars

SkyMaster 25x70

Low-light, long range binoculars

SkyMaster 20-100x70

Zoom, Low-light, long range binoculars

SkyMaster 20x80

Low-light, long range binoculars

SkyMaster 25-125x80

Zoom, Low-light, long range binoculars

SkyMaster 25x100

Low-light, long range binoculars

Warranty Terms and Conditions

Celestron gives Limited Lifetime Warranty for SkyMaster Binoculars. The company repairs or replaces damaged products, without charge. However, it doesn’t include No Fault Policy – doesn’t cover damages due to mishandling, misuse, neglect or accidental damage. Product exteriors - armoring and lenses are fully covered for 5 years against defects, not scratches or blemishes. Accessories such as lens covers, neckstraps and cases are fully covered for 2 years. Loss of the product or accessories is not covered. Collimation and optical alignment issues must be claimed within 30 days of purchase. You can claim the warranty with receipt as a proof of purchase.

You can learn more about our own warranty policy on the following link: https://www.optics-trade.eu/en/warranty-policy.html

No matter what happens to your binoculars, we will be here to help you.


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Celestron Skymaster 25x100 Specifications

Binoculars seriesCelestron Skymaster
Made inChina
In production since-
Warranty2 years
Type of prism Porro
Variable magnification No
Magnification. 28.5513x
Diopter adjustment -
Lens size diameter. 100 mm
Exit pupil. 4.4772 mm
Field of view - FOV... 59.2312m/1000m
Field of view (angular). 3.359°
Apperent FOV (angular).
Eye relief distance. 17.0512mm
Closest focusing distance. 27.5218m
Twilight Factor 50
Light transmittance -
Relative Brightness 16
Lens coatings Multicoated
Length.437.8727 mm
Width.288.9057 mm
Height.146.7099 mm
Working temperature range-
Filled with Nitrogen
Focusing system Central
Diopter setting locationRight eye-piece
Minimal interpupillary distance.62.7936 mm
Maximal interpupillary distance.80.7347 mm
Type of BodyOpen bridge
Water proof Yes
Fogproof Yes
Tripod compliantNo
Built-in Compass No
Built in Range finderNo
Image stabilization (IS) No
Able to float No


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