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are identified by a simple code. The code is usually two numbers separated by an "x," like 7x35 binocular, for example, the object appears to be seven times closer than you should normally see it without a binocular. This applies to telescopes as well. The number immediately following "x" is the diameter in millimeters of the objective (front) lens. The larger the number, the more light the binocular gathers and the brighter the image will be.

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Binoculars or binocular telescopes, are really two identical symmetrical telescopes mounted together. Because they point in the same direction, they allow the viewer to see a far greater distance than with the naked eye. A binocular has a big advantage over single telescopes as you can see through both eyes and they are easier to hold steadily with two hands. The Optics The objective lens diameter generally determines how much light is allowed while the magnification will display the ratio of the focal lengths. An example is 8 X 35 (eight times magnification and 35 mm objective diameter) or 7 X 50 (seven times magnification and 50 mm objective diameter). In these two examples, the first one has a higher magnification ( 8 over 7) but allows less light (35 mm is smaller than 50 mm) than the second one. If you are requiring for low light use, buy the biggest objective diameter. Lens Construction and Coatings Unfortunately, in any optical instrument used for images (e.g. a telescope, camera, microscope, etc.) light is often reflected and distributed into the view. This can reduce contrast. Reflection can be reduced by adding coating to the optics. Some of the newest techniques are phase-corrected prism and dielectric prism coatings. Binoculars designed from the Porro prism design are generally brighter than a roof prism design but newer technologies are reducing the differences (the Porro prism still have the highest value at a lower price). Choosing binoculars Roof-prism models are generally lighter and smaller than Porro models, but you will usually pay more. If the are sealed and filled with nitrogen gas, they will not cloud with condensation. Manufacturers Include Bushnell Performance Optics Canon Docter Optik Eschenbach Optik Fujinon Kowa Leica Leupold & Stevens, Inc. Minolta Miyauchi Nikon Olympus Optolyth Pentax Russian Military Binoculars Sicong Steiner Swarovski Optik Vixen Vortex Optics WDtian Yunnan State Zeiss To read more on Bird Watching, please visit Bird Watching USA: Your Guide to Birds http://www.bird-watching-usa.com/ Your Bird Watching and feeder resource for the birding enthusiast.

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	Binoculars - Nothing Escapes These Eyes By Sharon Albright Binoculars are devices that make small objects at a distance appear expanded and clear before your eyes. They are also known as binocular telescopes as they are basically two monocular placed Read more...

	Binoculars - Double Vision? By Diana Mettarod Binoculars are used for a lot of things. The word means “two eyes.” Although, really, when we use binoculars, we’re kind of a four-eyes, aren’t we? Bird-watchers, hunters and amateur astronomers are Read more...

zeiss jena binoculars