Binoculars » Brunton http://lightbinoculars.com Information on Binoculars for Astronomy, Bird Watching, Hunting, Sports, and Marine Thu, 09 Jul 2009 21:44:33 +0000 http://wordpress.org/?v=2.9 en hourly 1 Brunton Eterna Porro Prism Binocular http://lightbinoculars.com/brunton-eterna-porro-prism-binocular/ http://lightbinoculars.com/brunton-eterna-porro-prism-binocular/#comments Thu, 15 May 2008 15:40:06 +0000 lj723 http://lightbinoculars.com/?p=46 Brunton Eterna 7x50 Military Style Porro Prism Binoculars with Ranging Reticle
Brunton Eterna 7×50 Military Style Porro Prism Binoculars with Ranging Reticle
Price: $577.49

The quality of Products remains the same after century of innovations. Bruton still looks for new ways to explore and improve our own.

This prism is named after the Italian optician Ignazio Porro who first discovered the mechanism of this optical design in 1854. Porro-Prism- which is a combination of double prism arranged in a Z-like configuration. Production of has drastically improved after the usage of porro-prism with objective lenses that are well separated but offset from the eyepieces. Porro-prism designs also allow benefit of folding the optical path so that the physical length of the is less than the focal length of the objective and wider spacing of the objectives gives better sensation of depth.

Features

• BaK-4 prism glass
• Full multi-coating
• Individual eye-focus
• /
• Nitrogen filled
• Aluminum frame w/ ergonomic body armor
• Ranging reticle in FOV
• Tripod/monopod compatible
• Limited lifetime warranty

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