I want to buy a powerful binoculars but don’t understand how to read their power binoculars ratings (50 x7, etc). Help!

I want to buy a powerful binoculars but don't understand how to read their power binoculars ratings (50 x7, etc). Help!

There are several things to consider in a pair of binoculars.

1. the magnification power. That is noramlly the first number 6,7,8,10,12,15. Any binocular with a power greater than 10 is impossible to hold steady. That is: the image shakes. Many professionals recommend only 8 power as the highest to prevent shake. I do not have a problem with 10x but I can not hold 12x steady at all.

2. the diameter of the objective lens. This number is normally the second number 30, 40, 50 etc. This specifies the diameter in millameters of the objective lens. The larger the Generic Cialis Online objective lens, the more light gathering ability. The most popular binoculars have 40 mm lenses. They are not too big or too heavy. Compact binoculars may have 20 mm lenses. They do have the advantage of being small and easy to cary. I used a pair of Pentax 10x20 for years.

3. This next item is not normally advertised except at internet sights specializing in binoculars. It is the eye relief. If you wear glasses. It is real important, because you do not want to have to remove your glasses to look through the binoculars. For eye glass wearers, at least 17 mm of eye relief.

4. field of view. This can be really important at times. The wider the field of view, the easier it is to find what you are looking through the binoculars. For example you see an airplane up in the sky. You put the binoculars up to your eyes, but you do not see the airplane anywhere in the view. Where is the darn thing anyway? With a wide field of view, you have a better chance of seeing it.

Now there are also specialized binoculars for astronomy. These are normally very powerful. 20x with very large objective lenses. 70 mm, 80 mm. They must be used with a tripod.

There are other considerations also. There are two types of binoculars on the market. Perro prism and roof prism. Perro's are normally a little less expensive. Roof Prism are normally water proof and fog proof.

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