Ornithology
484
Binocular-buying
tips
If you
do not own binoculars, please consider putting them on your holiday
wish list. While we do not require you to buy your own, you will need
them throughout the course and if you do not have a pair, you'll have
to find some to borrow. Check out eagle
optics for some options--they
have very helpful salespeople when you phone them. I recommend 8x42 for
general birding.
The Pentax DCF HR II 8x42 are excellent value.
Binoculars
are indispensable for watching birds. They
will serve you well throughout your
life-time, so buy the best you can afford.
If you simply cannot afford anything, please come and
see
me—we’ll work something out. The quality
of your birding experience is strongly influenced by the quality of
your
binoculars. Keep these factors in mind
when choosing a pair:
Light
over magnification. Many people who
do not know anything about
binoculars believe that the higher the magnification (the first number
in of,
for example: 7 x 24, 8 x 42, 12 x 50).
Not so! Light gathering
capabilities are influenced by the size of objective lens (the large
lenses on
the bird side of the binoculars) and are represented by the second
number
above. As the magnification:light ratio
increases, the field of view gets smaller making birds harder to find,
and the
birds won’t seem as crisp because fewer light waves are getting to your
eyes. The problem is, to make 12 power
binoculars with an appropriate magnification:light ratio would mean
having
absolutely huge, heavy binoculars. I
like 8 x 42’s. People who do a lot of
seabird work (and have to focus on very far-away birds) often opt for 8
power. Many 7 power binoculars are
perfectly adequate for most birding purposes.
Lens
quality and coatings really
do matter. This is a more
complicated subject and one that I don’t entirely understand. However, there is a lot more to the quality
of binoculars than just the magnification and light-gathering
capabilities, and
the huge range in price of binoculars has much to do with lens quality
and
coatings. In general, more coatings are
better (inside and out). Nitrogen purged
is good (reduces fogging). Waterproof is
good (you don’t have to worry about when it rains but not such a huge
deal in
the desert). Roof prism “H”-shape binos
(as opposed to porro prism which are the classic M-shape) are usually a
little
lighter, easier to handle, and have fewer moving parts on the outside. The image appears larger and most high-end
binoculars are roof prism design.
However, a roof prism design doesn’t necessarily imply that a
difference
in quality.
Size
and weight. You don’t want to buy
something that you
don’t want to have around your neck all day every day.
It’s better to have a pair of compact
binoculars than to not have them with you at all because you’re tired
of
lugging them around.
Price.
Reasonable binoculars don’t have to be
expensive if you shop wisely. Think of
it as a textbook that you will continue to use long after this class is
over. Do not rush out to Walmart
and buy the first thing you find on the shelf.
Talk to experts at a binocular store either locally or phone
Eagle
Optics (800-
289-1132, http://www.eagleoptics.com/).
A good salesperson will help you find the
best quality for your price range. Then
consider asking a relative for a pre-graduation present!