Magnificent views of the world around you and the heavens above
Celestron SkyMaster 20x80 Binoculars in stock
#09117
$129.95
Oversize
Celestron SkyMaster 20x80 Binoculars
- Four-element objective lens for ultra sharp focus across the field of view
- Multi-Coated optics for sharp, clear views
- Integrated tripod adapter rod for ultra-stable tripod mounting
- Long eye relief ideal for eyeglass wearers
- Deluxe padded carrying case included for travel and safe storage
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. Each SkyMaster model features 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.
For maximum stability and secure optical alignment, this 80mm SkyMaster model features enhanced structural reinforcement to the main binocular body. As an additional convenience, the 80mm also includes an integral super rigid photo tripod adapter. The SkyMaster Series binoculars are built to provide years of magnificent views of the world around you and the heavens above.
Warranty Information
Orion products are covered by a limited, non-transferable warranty. Products sold through this website and our catalog that do not bear the Orion Brand name are serviced and supported exclusively by their manufacturers in accordance with terms and conditions packaged with the products. Orion's Limited Warranty does not apply to products that are not Orion-branded, even if packaged or sold with Orion products. Please contact the manufacturer directly for technical support and customer service.
Product Specifications:
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Use
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Astronomy and terrestrial |
Telescopes can have multiple uses depending on their design. Refractors and Cassegrains can provide a "correct-image" view, so they can be used for daytime land viewing as well as astronomy. Reflectors render the image upside down so they are not recommended for daytime viewing. This is not an issue for astronomy, however, because there's no "right-side up" in space.
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Magnification
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20x |
A measure of the enlargement of an object seen through an optical instrument. More specifically, it is a measure of the angle subtended by an image viewed with optical aid divided by the angle subtended by the same object without optical aid. Magnification is determined by dividing the focal length of the telescope (or binocular) by that of the eyepiece. Hence a telescope with a 1200mm focal length and an eyepiece of 40mm yields a magnification of 30x. The human eye is considered 1x magnification.
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Optical diameter
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80mm |
The optical diameter (also known as aperture), is the size of the telescope's main light collecting lens or mirror, measured in millimeters or inches. As the diameter increases, more light is collected and the resolution increases.
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Field of view - angular
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3.2-deg |
The field of view expressed as part of a 360-degree circle. Holding your pinky finger out at arms length is approximately 1-deg wide. To convert this to the linear measurement of "feet at a thousand yards", multiply by 52.5. For example, at 1000 yards distance, a 7-deg binocular will see a width of 367.5 feet (7 x 52.5)
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Field of view - linear
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167.6 ft./1000 yd |
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Apparent field of view
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64.0-deg |
The edge-to-edge angular diameter of the light emerging from the eyepiece as seen by the eye. It is an inherent specification for a given eyepiece type or design. The apparent field of view of an eyepiece is directly related to the true field of view seen through the telescope; for a given focal length eyepiece, the greater the eyepiece's apparent field of view, the greater area of sky will be seen.
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Eye relief
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17.0mm |
The distance, measured in millimeters, between the observer's eye and the eyepiece lens in which the entire field of view remains visible. Eye relief varies with the optical design but generally increases with decreasing magnification. Long eye relief is advantageous for observers who wear glasses, as they don't have to put their eye directly on the eyepiece to see the entire field of view, nor do they have to remove their eyewear.
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Exit pupil
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4.0mm |
The diameter of the circle of light exiting the telescope eyepiece. It appears as a distinct disk when the telescope is pointed at a bright source like the Moon. Also known as the Ramsden disk, the exit pupil varies with both aperture and magnification.
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Near focus
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80 ft. |
The minimal distance at which a binocular and/or spotting scopes can attain focus. Near focus is an important quality for bird watchers and wildlife devotees who want to get as close as possible to their quarry.
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Coatings
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Multi-coated |
Lenses are coated with an anti-reflective material to ensure that as little light as possible is reflected away, thus more gets to your eye. Good lenses are at least "fully coated," with a single layer of magnesium fluoride applied to each air-to-glass lens surface. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more lens surfaces have multiple coatings. "Fully multi-coated" is superior because all lens surfaces are multiple-layer coated.
Mirror star diagonals are coated with a reflective material similar to telescope mirrors in order to reflect the light into the eyepiece. Standard aluminum coatings reflect between 88%-92%, and enhanced aluminum reflects 97%.
Dielectric coatings use a different process to deposit a coating that reflects 99% of the light. In addition to the higher reflectivity, Dielectric coatings are much more durable than aluminum coatings, so they last longer and can be cleaned with less risk of damage.
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Prism type
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BAK-4 Porro |
Porro Prisms:
A binocular prism system that contains two right-angle prisms in each barrel offset from one another, requiring that the objective lenses be spaced farther apart than the eyepieces. Optically, Porro prisms often perform better than their Roof prism counterparts.
Roof Prisms are a compact binocular prism system that allows the objective lenses to line up directly with the eyepieces and hence yields a more portable binocular. Roof prism binoculars lose slightly more light to reflections than Porro prism binoculars. High-quality roof prism binoculars compensate for this with special optical coatings.
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Focus style
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Center focus |
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Tripod adaptable
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Yes |
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Diopter adjustment
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Yes |
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Weight
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5.9 lbs. |
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Warranty
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Limited lifetime |
Included Items:
Orion XHD Paragon-Plus Tripod
$141.95
Binocular Highlights Book: 99 Celestial Sights
$24.95
Binocular Stargazing Book
$12.95
