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Bird Watching Binoculars
Bird watching is a fascinating hobby that can become a lifelong
pursuit. While many just like looking at the birds that visit
their backyards, others want to learn more about these
interesting animals. One of the best ways that you can observe these
creatures is with a pair of bird watching binoculars or ‘bins’ as
the bird lovers call them.
Of all the people who use binoculars and spotting scopes,
birders
are probably the most demanding. Birders bird in environments that
include deserts at temperatures above 125º, high mountains, dense
forests, windy plains, beaches, mudflats, rolling oceans, and the
arctic and Antarctic, in sun, rain, fog, and overcast. Birders bird
from dawn to dusk, then go out at night to look for owls. Through
all of this, birders demand good views of the finest feather details
to determine not only the species of the bird, but its age and
gender as well. Much of the time, the birds are moving.
The simple answer is to get the best equipment you can afford that
fit your birding style and feel right when you use them. If
you're brand new to birding, you have a few options. You can get an
inexpensive binocular, borrow a pair from a friend, or you can read reviews, decide what you
like, and get a top quality pair of binoculars to start out with.
A compact model is good if your bird watching includes hiking or
going on long distance bird trips where the amount of weight that
you carry is a major consideration.
And you will want them to be comfortable in your
hands. You will also want them to be comfortable
when they’re pressed up to your eyes.
Your binoculars should be able to focus very quickly and up close
as well. They must be able to work and allow you to see even in dim
lighting. Dust and moisture shouldn’t be able to cause problems for
you when you’re out in the field.
Having a good pair of binoculars can make your bird watching
experience much more enjoyable.
There are several things that you should take into
considerations
before you buy a pair of bird watching binoculars.
Things to look for in a
Good Pair of
Bird Watching Binoculars
- Power
The Power (or magnification)
should be at least 7. The power is the first number given that
describes binoculars. For example, a "7 X 35" pair of
"glasses" will make objects appear as if they are seven times as
close as they actually are. Seven-power binoculars are about the
minimum needed to see birds well.
Binoculars 10-power or
stronger can be difficult for some birders to hold steady. More
magnification results in larger objects in the view and more
ability to distinguish detail. It also means that the binoculars
will be harder to hold steady, a narrower field of view, and
less apparent depth of focus. There are tricks to make it easier
to hold binoculars steady, but even 10x may be too difficult for
some people to handle.
- Object Lens
The Object Lens number (the
second number) should be at least five times larger than the
power number. Such as "35" for a "7 X 35" pair or "40" for
an "8 X 40" pair. This second number describes the
diameter, in millimeters, of the
large lens that faces the object of interest. The larger this
lens is, the greater the amount of light the binoculars allow in
and thus the easier it will be to see details in dim light or on
a dull-colored bird.
- Field of View
Field of view, stated in feet (or meters) at 1000 yards (or
meters), is the width of the scene that is in view. A wide field
of view makes it easier to find birds when looking through the
binoculars. The trade-off is in loss of the ability to resolve
detail. Other factors being equal, lower magnification means
wider field of view, but increased eye relief and nearer close
focus also narrow field of view. Too wide a field of view will
often result in distortion at the edges of the image.
Look at a sign with large letters. The letters close to the edge
of the field of view should appear as sharp and well-formed as
the letters in the center of the field of view. Image distortion
near the edges is common in cheap binoculars. It's kind of like
looking through a fish-eye lens. Look for a pair that has
minimal distortion.
- Weight and Balance
They should be light enough so you can use them for two
hours without tiring or getting aching muscles. If they
are too heavy you might end up with a sore neck because your
binoculars act like a heavy yoke.
Weight is often overrated in binocular specs. Today's
construction materials are lighter and stronger than ever
before. With some mid-priced, bright, quality, 10x50 binoculars
weighing less than 30 ounces, any able-bodied adult should be
able to handle them easily. Unless you are very experienced, you
would have a hard time picking up a binocular and telling
whether it weighed 28 ounces or 32. Even over a day's use, it is
doubtful most people would know the difference.
A real concern should be balance. A well balanced binocular
should put very little stress on your arms, wrists, and hands. A
poorly balanced pair, even if it is lighter, will strain your
muscles
- Focusing Speed
The focusing mechanism should be easy to adjust. focusing can be
a joy or a pain. The keys to a good focusing binocular are speed
and precision.
If you can't change focus quickly, you'll miss the bird. A good
focusing mechanism will go from close focus to infinity in a
full turn (360º) or less
- Coatings
When you look at the large objective lenses a foot away,
they should reflect a bluish or purplish color. This means
the lenses are color-coated which reduces internal glare and
increases the amount of light that gets to your eyes. This
coating should be free of any blotches or scratches.
- Eye Distance
You should be able to move the barrels of the binoculars
close enough together so the image you see merges into a single,
clear image in a single circle. If the image isn't singular or
clear, the binoculars may be out of alignment or the eyepieces
may not come close enough together to accommodate the distance
between your eyes. These two problems can cause eye strain and
severe headaches.
- Eyeglasses
If you wear prescription glasses your binoculars should have
rubber eye cups that fold back. This lets you to put your
glasses against the eyepieces and gives you a larger field
of vision.
If you are nearsighted or farsighted, you can use your
binoculars without wearing glasses and the focus will
compensate. However, if you have astigmatism, you will need to
use your glasses.
- Close Focus
All binoculars can focus at infinity. The real trick in
binocular design is in how closely it can be made to focus. Any
birder (or butterflyer) who started out with a cheap pair of
binoculars has experienced standing 10 or 15 feet behind the
rest of the group to look at a bird that was inside their close
focus capability.
General-purpose binoculars have a close focus
around 20 to 25 feet. A good birding binocular should have a
close focus of 10 feet. Some binoculars can not focus this close, so you may
miss birds in a nearby bush.
- Weatherproofing
Weatherproofing ranges from none to shower proof to waterproof
to nitrogen purged. Waterproof sealing is done with rubber "O"
rings. Active birders should get nitrogen purged waterproofing,
whether they live in a humid climate or not. Nitrogen purging
can also keep out dust, sand, or anything else that can get
inside the binoculars. That's why most birders prefer
"weatherproofing".
- Body (Prism) Design
This is one of the most basic choices in choosing your
binocular.
- Porro prism binoculars
have an angled design. When they stand on their barrels the
figure M can be seen. The
focusing mechanism which is an external wheel moves the eyepieces
along an external barrel.
Porro Prism binoculars are less expensive than roof prism
binoculars. You can get the same optical quality for
significantly less money. However, they are heavier and
harder to weatherproof.
- Roof prism binoculars
have 2 straight side by side barrels. When they stand on the
barrels the figure H can be seen. Roof prism binoculars have
internal focusing, but you need to adjust the focus with an
external knob or wheel.
A Roof Prism binocular of the same optical quality will be
lighter and have fewer problems. Even though they cost more,
they will probably be more rugged, and in the long run, they
may also be more cost effective.
Digital
Camera Binoculars
Finally, there is a special kind of bird watching binoculars that
combines a digital camera with binoculars. You can focus on you
bird subject and record a digital image at the same time.
There are many models available and the Bushnell Instant Replay
8x32 digital-camera binoculars is a nice pair, having good optics
and camera features.
Some digital-camera binoculars just add a fixed-focus digital
camera between the two binocular barrels, Bushnell builds a
3.2-megapixel camera into the binoculars so they focus together
(down to 11 feet), which eliminates parallax distortion -- a major
complaint about some digital binoculars.
This camera takes stills and 320x240 video clips in continuous
loops, and an "instant replay" feature lets you save the last 30
seconds of footage. You can play them on a TV or download images to
a PC or a Mac.
This pair runs about $400, which is on the upper end of Camera
Binoculars. But you can get a basic pair for as low as $50
which won't have all the features as the high end models.
Your bird watching hobby was never so
easy and fun than when you have a good pair of bird watching binoculars in
your hands.
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