Porro prisms 

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Multicoated optical system High-grade BaK-4 prisms Large aperture, ideal for low light conditions and astronomy Long eye relief, ideal for spectacle wearers Dioptric adjustment to compensate for different levels of visual acuity
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Easy to Use Center Zoom Lever BaK4 prisms for crystal clear images. Zooms from 10X to 30X Close focus under 10 feet. Tripod adaptable for high power, long observing sessions.
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Wide Angle Porro Prism 8.3° Angle of View
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An ideal choice for beginning astronomy Suitable for nature viewing Sharp and clear views Lightweight and usable on hand (It's recommended to use a tripod for observing celestial objects)
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BAK4 Prism Glass Porro Prism Design Fully Multicoated Optics Waterproof Housing Center Focus Wheel Twist-Up Rubber Eyecups 18mm Eye Relief
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Heavy duty, extremely robust and high precision marine instrument Nitrogen Filled Excellent Image Quality Rubber armor
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for astronomers, hunters, birdwatchers and adventurers robust and shock-resistant binoculars nitrogen-filled for use in any weather from the small to the enormous - for nature-watching and astronomy high optical performance. brilliant and sharp images, right out to the edge stable focusing due to individual eyepiece adjustment each pair of binoculars...
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$ 71 $ 84 -15%
50x Magnification bright view ability to see clear even in dim light Powerful zoom with different magnifications ideal for all outdoor activities and sporting events Fully coated optics for crisp and sharp images Ruby lens to minimize glare Includes carrying case and neck strap
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     High resolution coated optics      Impact resistant and rubber armored-50mm objective lenses-Comes with a soft case, neck strap, and lens caps
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$ 26
Out of stock
Reverse Porro Design BK7 Prism Glass Multicoated Optics Waterproof Housing Center Focus Wheel Twist-Up Rubber Eyecups 10mm Eye Relief
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$ 50
Out of stock
Reverse Porro Design BK7 Prism Glass 7-21x Magnification Range Multicoated Optics Waterproof Housing Center Focus Wheel Twist-Up Rubber Eyecups 12-9mm Eye Relief
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$ 149
Out of stock
BAK4 Porro Prisms Wide Angle FOV Multicoated Optics Tripod Adaptable Center Focus
Showing 1 - 12 of 48 items