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Astronomy & Telescope Astronomy: Binoculars

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  Binoculars Binoculars: Astronomy: Binoculars - Test-IN-STORE TESTS

IN-STORE TESTS

Try before you buy is a good rule with binoculars. When comparing the models available, carry out these simple tests.

 
 
  Posted by astronomy on Monday, November 29 @ 02:27:02 CST (10 reads)
(Read More... | 1595 bytes more | comments? | Binoculars | Score: 0)
 

 
  Binoculars Binoculars: Astronomy: Binoculars - Prism-TYPES OF PRISMS

TYPES OF PRISMS

Binoculars are made with one of two types of internal prism: porro prisms or roof prisms. Porro-prism binoculars, the most common type, have a zigzag shape. They are the best choice for skywatchers.

 
 
  Posted by astronomy on Monday, November 29 @ 02:25:46 CST (9 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - LENS COATINGS

LENS COATINGS

A key difference in otherwise similar binoculars is the lens coating. Optical coatings give the lenses a blue, green, amber, or red tint. They improve image brightness and contrast, without affecting the color.

 
 
  Posted by astronomy on Monday, November 29 @ 02:24:46 CST (9 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - Focus-IN FOCUS

IN FOCUS

Waterproof binoculars often have two focus adjustments, one on each eyepiece. These individual-focus models are awkward for daytime use, but are fine for astronomy because every subject is located at infinity, requiring only one focus setting.

 
 
  Posted by astronomy on Monday, November 29 @ 02:17:50 CST (9 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - FlELDS OF VIEW

FlELDS OF VIEW

The field of view is usually stamped on binoculars, but may be given as "feet at yards." For example, 367 feet at 1,000 yards equals a 7 de-gree field of view, and 262 feet at 1,000 yards equals 5 degrees.

 
 
  Posted by astronomy on Monday, November 29 @ 02:16:38 CST (10 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - EYE RELIEF

EYE RELIEF

Eye relief is the distance that your eyes must be from the binocular eyepieces to see the whole field. An eye relief of less than 9 mm makes for uncomfortable viewing.

 
 
  Posted by astronomy on Monday, November 29 @ 02:15:48 CST (9 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - THE EXIT PUPIL

THE EXIT PUPIL

The exit pupil of a pair of binuculars is the diameter of the beam of light leaving each eye-piece and entering each eye. It is easy to calculate—simply divide the aperture by the power. For a 7 x 50 model, the 50 mm aperture divided by the 7 power equals a 7.1 mm exit pupil.

 
 
  Posted by astronomy on Monday, November 29 @ 02:15:00 CST (9 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - BINOCULAR MOUNTS

BINOCULAR MOUNTS

If you mount binoculars on a steady tripod, you will see much more detail in everything you look at. Many binoculars feature a centrally located threaded socket. This accepts an L-shaped bracket, which in turn bolts to any camera tripod.

 
 
  Posted by astronomy on Monday, November 29 @ 02:14:04 CST (9 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - CARE OF BINOCULARS

CARE OF BINOCULARS

With care, binoculars can last a lifetime. Avoid touching the lenses with your fingers and clean them as you would telescope eyepieces.

 
 
  Posted by astronomy on Monday, November 29 @ 02:13:08 CST (9 reads)
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  Binoculars Binoculars: Astronomy: Binoculars - WHY BINOCULARS

WHY BINOCULARS?

The advantages of a pair of binoculars over a telescope are significant. Binoculars are inexpensive and readily available. Most are lightweight and |require no effort to set up.

 
 
  Posted by astronomy on Monday, November 29 @ 02:12:01 CST (11 reads)
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Monday, November 29
· Astronomy: Binoculars - BIG BINOCULARS
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