Magnification
In simplest terms,
magnification is a measure of
how many times better you
can see an object through
your binoculars than with your
naked eye. In the standard
specifications for a binocular
model, magnification is
reflected by the first number
you see. For instance,
eight-power magnification:
eight times better than the
naked eye.
In simplest terms,
magnification is a measure of
how many times better you
can see an object through
your binoculars than with your
naked eye. In the standard
specifications for a binocular
model, magnification is
reflected by the first number
you see. For instance,
eight-power magnification:
eight times better than the
naked eye.
Field of View
Avid binocular users pay attention to this critical performance factor, because
field-of-view is the actual width of the sight picture provided by your binoculars at a
specific distance. Field-of-view is determined by magnification and the focal
lengths of the objective and eyepiece lenses. But one thing is always true: More
magnification means less field-of-view.
Field-of-view may also be expressed in degrees, which is called the angular field.
To convert angular field to the more practical linear field, multiply the angular field
by 52.5.
Twilight Performance
Using the below formulas gives a basic evaluation of low light performance,
however, one must keep in mind that they are mathematical formulas and do not
take into effect some of the most critical features in optics; glass quality, number of
lenses, precision of manufacturing and coatings.
Interpupillary Distance
The center-to-center distance between an adult person's eyes averages between
58 to 72mm, and is described as the Interpupillary Distance (PD). The binocular
should be capable of any setting between those two measurements. When the
user makes this adjustment correctly, the sight picture forms a single round circle.
When it's slightly out of adjustment you can see two distinct circles, as it is often
depicted in the movies. This is corrected by folding in or separating the barrels of
the binocular. All binoculars are hinged at the center for this purpose.
Avid binocular users pay attention to this critical performance factor, because
field-of-view is the actual width of the sight picture provided by your binoculars at a
specific distance. Field-of-view is determined by magnification and the focal
lengths of the objective and eyepiece lenses. But one thing is always true: More
magnification means less field-of-view.
Field-of-view may also be expressed in degrees, which is called the angular field.
To convert angular field to the more practical linear field, multiply the angular field
by 52.5.
Twilight Performance
Using the below formulas gives a basic evaluation of low light performance,
however, one must keep in mind that they are mathematical formulas and do not
take into effect some of the most critical features in optics; glass quality, number of
lenses, precision of manufacturing and coatings.
Interpupillary Distance
The center-to-center distance between an adult person's eyes averages between
58 to 72mm, and is described as the Interpupillary Distance (PD). The binocular
should be capable of any setting between those two measurements. When the
user makes this adjustment correctly, the sight picture forms a single round circle.
When it's slightly out of adjustment you can see two distinct circles, as it is often
depicted in the movies. This is corrected by folding in or separating the barrels of
the binocular. All binoculars are hinged at the center for this purpose.
Width
As with eyeglasses, binoculars
must fit the width of the user's
eyes to be effective. The
natural accommodation was to
design sturdy hinge systems
that allow you to adjust for
your particular Interpupillary
Distance (ID), which is the
center-to-center distance
between your pupils.
As with eyeglasses, binoculars
must fit the width of the user's
eyes to be effective. The
natural accommodation was to
design sturdy hinge systems
that allow you to adjust for
your particular Interpupillary
Distance (ID), which is the
center-to-center distance
between your pupils.
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