Canon 10x30 IS II Manuel - Sayfa 8

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The optical structure of each model of binoculars is different,

so even if the magnification rating is the same, how much view

the pair of binoculars can pull in will differ. The width of the

view you can see through the binoculars is called the field of

view. For bird watching in a large forest, using a wider field of

view will be more useful.

1) Real field of view

This is the view through the binoculars (Fig. 5-a), and it is

measured from the center of the objective lens and expressed

in degrees (angle). The lower the magnification the binoculars

have, the wider the real field of view—and the higher the

magnification, the narrower the field of view. Because of this, it

is hard to compare the real field of view of binoculars with that

of binoculars of different magnification rating.

This is the value of the real field of view multiplied by the

magnification (Fig. 5-b). For example, if 10x magnification

binoculars have a 5x real field of view, the apparent field of

view will be 50˚. This value represents the field of view which

you will see looking through the binoculars. It is comparable

even among binoculars of different magnification. In general,

if the apparent field of view is more than 65˚, it is considered

a wide field of view.

Apparent field of view = Magnification x Real field of view

The field of view, measured in meters, which you can see 1.000

meters in front of you.

Field of view at 1.000 meters = 1.000 x 2 x tan (

(Fig. 5) Looking through 10x/5˚ binoculars at a subject 1,000 meters away

c Field of view at

87 meters:

100 meters(1000/10)

100m(1000/10)

b Apparent field of view: 50˚

(Fig. 5)

Real field of view

1.000 meters

1000m

a Real field of view: 5˚

) [m.]