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A binocular instrument is one that you look through with both eyes, to make things look larger. There are binocular telescopes, binocular microscopes, and so on, but the word is usually applied to a "field glass," which is small and light enough to hold to your eyes with your hand, and which allows you to see things that are far away. The field glass is actually two tubes, or small telescopes, joined together at the top. Each tube has a lens at both ends. A lens is a glass that lets light come through it.

Without light you could never see anything. The light comes through the lens at the bottom. This is called the objective lens. Whatever light comes through the objective lens is enlarged or magnified. In a modern, or prism, binocular, the light goes straight in and hits a prism.

A prism is a piece of glass cut at angles so that it forms a sort of triangle. The prism sends the light to another prism beside it. From here the light goes to the lens in the eyepiece, through which you look. The prisms are very important, because they change the direction of the light.

As light from an object enters the objective lens it is upside down, but the prisms turn it right side up again. The prisms also make it possible to see a wider view. The objective lenses are farther apart than the eyes, and the prisms bring the light inward to the eyepieces that are closer together. A binocular is described by its poiver and its field. A "six-power, thirty-five" binocular (written 6x, 35) makes things look six times as big as they seem to the naked eye and has an objective lens that is 35 millimeters in diameter (almost an inch and a half across). The most useful binoculars for everyday use are six- or eight-power, and the best field on these is 50-millimeter. Some binoculars used in the army and the navy can enlarge an object as much as 144 times

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After the Recent Binocular “revolution”, How Do I Choose the Right Pair of Binoculars for My Needs?

The following is an article written to teach the customer basic terminology that is used when discussing the 21st century first binocular generation. This article covers the two most important groups of terms. The first group of terms or jargon involves the roof and porro prisms. The second of the two most important terms needed to learn to understand and to say are numbers rather than more words.  They are one small and one larger number separated by an “x”. An example is 8 x 32.  Read the article and both words and numbers will all be explained to your satisfaction.

 

 

When one speaks of a binocular “revolution”, the reference is to all the manufacturers involved in producing numerous different models of binoculars.  What happened and when?  18-24 months ago, several well-established and highly respected manufacturers involved in the use of optics decided to use current new technology and mix it with the basic binoculars of the time.  At that time, binoculars differed mainly by their manufacturer, the actual size of the pair of binoculars, and their price, which was manufacturer notoriety dependent.

 

Now prior to 2 years, the selection of a pair of binoculars was quick and easy.  Now, however, if a consumer decided to look for a pair of binoculars for their specific needs, their task can quickly and suddenly become an overwhelming one.  A consumer now has to have a background (such as given to them in this article) on the new generation of binoculars, so that their pick will fulfill their needs.

 

Customers are now faced with choices of manufacturers, models, and functional types with prices ranging from a low of $30 to highs in the hundreds and thousands of dollars.  The best way to handle all this information is to simplify it so that the pair you buy is the pair you need.  Once you set out to learn the new terminology or jargon used to describe these binoculars, you will realize how lucky you are to have this new generation available.

 

All current types of binoculars can be divided into two groups: the porro prisms and the roof prisms.

 

The models in the porro prism category tend to be the more traditional looking pairs of binoculars with their lenses offset, while appearing as wide as they are long.  These same models tend to be heavier and bulkier.  One very positive aspect of porro prism model design is that they tend to let in more light than their counter parts.  This extra light produces sharper and brighter images.

 

On the other hand, roof prism binoculars look like the connection of two straight tubes.  The designs are much newer allowing for production of more compact binoculars.  Their lenses can still be fairly large, similar to the porro type binoculars.  Due to their newer designs, even with large lenses, the physical weight and size of these binoculars can still be greatly reduced.  On the whole, roof prisms tend to be small and lighter weight binoculars as compared to the slightly older and heavier porro cohorts.  To repeat, porro binoculars tend to produce sharper and brighter images than the lighter in weight, and smaller in size roof binoculars.

 

The second important jargon used to describe a pair of binoculars involves numbers rather than words.  This descriptive language is written as one small number and one large number separated by an "x".  The first number on the left side of the x represents the number of time the object is magnified when viewing it through the lens.  The number to the right of the x represents the diameter of the objective lens, expressed in millimeters.  Therefore, the combination of 8 x 32 means the object appears to be magnified eight times while seeing it through a lens that is 32mm in diameter.

 

Therefore, when setting out to pick the binoculars best for you or as a gift, it is important to learn about and understand the two types of prisms and the meaning of the two number, separated by an x.  The first number to the left of the x represents the number of magnifications one sees the object while looking through the two lenses. The second number or the one to the right of the x represents the number of mm of the diameter of the lens. The higher the number to the right, the larger the lens diameter and the more light that can get through.  The more light, the brighter and sharper the image appears.  Unfortunately, the larger the diameter of the lens, the heavier and bulkier is the pair of binoculars, the more cumbersome it is to carry.

 

In an upcoming article, I plan on delving even deeper into the specifications that are used to understand and help the customer in finding that pair that will fulfill their needs best.

 

About the Author

Reed Oxman, the author of the above, is also creator and owner of the best place to purchase your needed Binoculars and Digital Binoculars , along with other types such as Waterproof Binoculars that you, your friends, or family may need. Bo rn and raised in California, he attended UC Berkeley Undergraduate, UC Los Angeles Medical School of Medicine and became Board Certified in Emergency Medicine and Pain Management.

My new telescope will not work!!!?

I bought an Uncle Milton "StarScope" on sale at Zellers and I assembled it and everything and when I look threw the eye piece it is just black and sometimes it like shows grey, and brown patches every now and then.

Features:

715mm focal length
72mm aperture
Erecting Prism
2x Barlow lens
2 eye pieces
Power range 38x - 206x
Red Dot finder scope
Red illuminated altitude/ azimuth dials
Illuminated compass
Metal tripod
Stellarium software

I am putting it in front of a window so I don't know if it is just reflecting back to my telescope without a clear image or what is going on. The guy at the store said they've only got good comments on this telescope but honestly it is just probably me because this is my first telescope.

Any help would be appreciated,

- Thanks.
One other question. what is a focuser? And how do I focus a telescope?

Well, I did a search on "Uncle Milton" and it seems to be a toy company. If I where you, I would box that piece of junk up, take it back and get a refund. If you are just starting out in astronomy, get a pair of binoculars. Use them, and if you are still interested, then invest in a real scope. Here is a pair of binoculars for $100. Check them out:

http://www.telescope.com/control/product/~category_id=binocular_standard/~pcategory=binoculars/~product_id=09333

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