![]() ![]() The glass for the prisms employed within all of the SkyMaster binoculars, and indeed most high-quality binoculars, is of the BaK-4 crown glass variety, which surpasses the quality of the more commonly found BK7 prisms in less expensive or substandard products. The objective lenses of the SkyMaster 20x80s are standard 80mm achromatic lenses like what would be used in a refractor, though with a fast f/ratio of f/4.11, meaning that they were not designed for the ability to deliver sharp images at high power without a lot of chromatic aberration – which is fine, since the magnification is fixed at 20x. However, they’re an excellent choice for those who want to try out the big binocular experience without a whole lot of expense. While they deliver striking and vivid views, using them requires a robust and accurately aimed tripod, placing them on par with a compact telescope in terms of the total cost as well as the effort needed for an enjoyable night of observing. Given the much higher mounting requirements and cost of a larger pair of astronomy binoculars, the Celestron SkyMaster 20x80s might be the largest you want to go – though they are still often not cost-effective compared to a telescope with similar or better capabilities. ![]() Telescopes article goes over what you gain by employing a pair of large astronomical binoculars like these versus a telescope, as well as some of the limitations. As such, these binoculars are really only intended for astronomical purposes. The SkyMaster 20x80s, as with any binoculars over 60-70mm aperture, require a tripod for use, and with these binoculars’ close focus distance of 108 feet, you won’t be able to focus the view on nearby terrestrial objects at all, let alone use them practically for such tasks. These are not to be confused with the more expensive SkyMaster Pro 20x80s. The Celestron SkyMaster 20×80 binoculars are the second-largest pair in the SkyMaster lineup after the 25×100 unit.
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