This is a professional large-aperture binocular with ED glass objective lenses for the very highest standards of colour fidelity and light transmission. This, coupled with weather sealed optics, rubber armour and heavy duty tripod adapter, makes the BRESSER Spezial Astro SF 20x80 ED Binoculars a fantastic choice for the serious Binocular Astronomer or Birdwatcher.
Thanks to fully multi coated Bak-4 glass prisms, the extra large objective lens diameter and highly corrected eyepieces (with 5 lenses in 3 groups), these binoculars provide bright, crisp images from edge to edge. The high 20x magnification it is ideal not only for observing astronomical objects, but is also practical for viewing distant terrestrial targets too. Full multi-coatings on every optical surface, ensure that stray light and ghosting is kept to an absolute minimum and allow you to simply enjoy the view, without annoying distractions. Individual eyepiece focusing means once set you've set your own personal focus at infinity, you can get on with the task of observing, rather than feeling the need to constantly adjust your focus. Foldable rubber eyecups give spectacle wearers the ability to get close enough to the eyepiece ocular lenses in order to make the best use of these optics’ field of view, but also provide added protection against stay incidental light for those users who don't wear glasses.
The binoculars are waterproof and nitrogen filled to avoid internal fogging. Ergonomic rubber armouring protects the binoculars against shocks and bumps in use and while being transported and also provides firm non-slip grip.
With the included heavy duty photo tripod adapter the SPEZIAL ASTRO ED can be mounted onto any photo tripod which offers a standard 1/4inch or 3/8inch thread. The use of a tripod is highly recommended to retain a steady image at a relatively high binocular magnification of 20x .
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The BT-ED70S-A uses ED (extra low dispersion) optics to reduce the effects of chromatic aberration