Their wonderful "No Fault" warranty coverage assures that your
binoculars will be repaired or replaced at Celestron's option for as long as you
own them-no questions asked!
What is the Angle of View?
It is easier to start with the field of view (FOV) of a pair
of binoculars, which is a measurement that indicates the width of the view you
see through the binoculars at a specified distance, it is most often represented
in feet at 1,000 yards, but increasingly common is in meters at 1,000 meters.
The angle of view (AOV) which is also known as the
Real field of view is the angle expressed in degrees between
the left and right extremes of the FOV and the center of the objective lenses of
your binocular (sounds complicated, but take a look at the diagram below). So in
the example represented in the diagram below, the field of view of theses
binoculars is 315 feet at 1,000 yards and the angle is 6°
Apparent field of view (AFOV)
manufacturers list their field of view as the Apparent field of
view, this is the value of the real field of view multiplied by the
magnification of the binoculars (Apparent field of view = Magnification x Real
field of view). This value is important because it is comparable even among
binoculars of different magnifications.
On top of this there is something known as the Apparent field of view ISO 14132-1:2002
standard, that some manufacturers are adopting, the formula is fairly
complicated, so for simplicity I will stick with the "standard" Apparent field
of view in this article.
What are Wide Angle Binocular Binoculars Best for?
A binocular with a wide field of view eyepiece will often have reduced eye
relief and a wider field of view also usually means a less powerful
magnification. So in general, the higher the magnification, the smaller your
angle of view, there is always a compromise and so you need to decide how you
will mostly be using your binoculars for and get your ideal setup.
Binoculars with a wide field of view (Wide Angle Binoculars) basically "fit"
more into the image that you see when looking through them, this makes finding
objects, especially moving ones that much easier. That is why the best bird watching binoculars tend to
have lower magnifications and higher FOV's especially in wooded areas. Obviously
if your main birding is done out in open areas like at the sea or on lakes and
dams, then a higher magnification may be preferable over a wide field of