Terra Incognita \"ter-a-in-kag-net-a"\ [L] (1616): unknown territory: an unexplored country.

Binocular guidelines

Good binoculars and their proper use can add immeasurably to enjoying wildlife. Each traveler with Terra Incognita Ecotours should decide well before a trip begins whether the binoculars you own are adequate and, if not, what kind of binoculars should be acquired.

Recommendation
Binoculars are rated with two numbers, e.g. 7 x 35. The first number is the magnification and the second is the diameter of the objective (the larger ones) lenses in millimeters. The first tells how much an object is enlarged and the second number is a measure of how much light-gathering power a lens has. As the second number increases so usually does the weight of a pair of binoculars. If one divides the first number into the second, the closer the result is to 5 the better the balance between weight, magnification and resolution.

Binoculars that are rated at 7x35, 8x40 or 10x40, are among the best for wildlife viewing. Binoculars with a center focus are much preferable over ones in which you have to focus each eyepiece separately. For some, image stabilized binoculars are an asset. Now it is a matter to decide on price and style.

The following is a checklist of things to do to make sure that you have the best binoculars and know how to use them.

Binocular cups
Binoculars usually are constructed so that you can raise and lower the cups that surround the eyepieces. If you are going to wear eyeglasses when using binoculars, roll or push the cups down. This will bring the lenses of the eyepiece the proper distance from your eye. If you do not use glasses then leave the cups unrolled or the eyepiece frames elevated.

Distance between eyepieces
All binoculars can be adjusted so that the distance between the eyepieces varies. You should move the eyepieces apart as far as they go, look through the eyepieces and gradually move the eyepieces together until you see a single image.

Adjusting each lens to your eyes
Binoculars usually have two focus adjustments, one that is a center focus that moves both lenses at the same time and one, called the diopter, that adjusts only one lens, usually the right one. To adjust the lenses to your eyes look through the binoculars with your right eye closed. With the center focus wheel, focus on an object 20-40 feet away. Then, with the left eye closed, focus the eyepiece on the right eye while looking at the same object. Now using the center focus make sure you see a sharp image. Most diopters have a numerical scale so that after you have made the adjustment it can be easily reset if it is accidentally altered.

Practice
When viewing wildlife it is helpful if when you raise your binoculars that they are pointed at what you are looking at with your naked eyes. If you cannot do that consistently a little practice would be helpful. Try looking at a flying bird, without taking your eyes off it, raise your binoculars and look through them. If you see the bird immediately, good, if not, bring your binoculars down and put them back up again after re-spotting the bird. Do this enough so that you can immediately see in your binoculars what you were seeing without them.

Wearing binoculars
If the weight of binoculars around your neck is bothersome, there are two things you might consider. One is to buy a neck strap, made of a spongy material at least an inch or more wide. The second is to buy a harness that fits over the shoulders and distributes the weight more evenly.