Canon 10x30 IS II Manuale - Pagina 12

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The ideal binoculars are ones that make you forget you are

looking through binoculars. If you purchase a pair with a wide

field of view, and the image quality is superior (enough that

there isn't much difference from looking with the naked eye),

you will have many enjoyable hours of use. Some people have

the misconception that because they only concentrate on the

middle of the lens, even if the outer part is blurred, it really will

not matter. Normally, the retina projects aberration-free images,

so when you view blurred images, the brain tries to disregard

them. If you consciously try to reject the blurred images for

a long period of time, there is a chance that you will become

very tired and even sick. It is very hard to determine the image

quality with just a spec sheet. The easiest and surest way is to

actually look through the binoculars. Please keep the following

points in mind when purchasing binoculars.

1) Do you see only one image or two?

Binoculars use two lenses parallel to each other. However, if

alignment during manufacture is not perfect, or owing to shock

during transport, the lenses may become just a bit off. If that

happens, you will see two images. Even if you get the binoculars

fixed, the lenses will tend to slip with just a slight jolt. Such

binoculars are not recommended.

Make sure that the lettering on a sign or the thin branches

on trees are crystal clear (See comparative photos "Resolving

Power" on page 7). Also, make sure that the lights at night

and the stars are not blurred and the shapes are not distorted

(photo a). It may be difficult to know how clear the image is

by looking through only one pair of binoculars. Try looking

through several, and you will be able to tell the difference.