Binoculars are essentially two small telescopes placed side by side, each consisting of a pair of lenses to bring distant objects closer and a pair of prisms in each chamber to steer the image upwards.
Binoculars can be used for hunting, bird watching, astronomy or watching the action at sporting events or shows.
Choosing the
best binoculars for the money is not an easy job. With proper research and field test, you can get a great optic for your glassing. For this good reason and to help you find the top-notch binoculars this guide is all about.
Here's how to choose binoculars to fit your needs in these 10 infallible tips:
1. Understand the numbers
Binoculars are referred to by two numbers, such as 7x35 or 10x 50. The number before the "x" is the magnification factor, or power. 7x35 lenses will make objects appear seven times closer, while 10x50 lenses will make objects appear 10 times closer.
The second number is the diameter of the main (objective) lenses, in millimeters. 7x35 lenses are 35mm (1.38 inches) in diameter, while 10x50 lenses are 50mm (1.97 inches) in diameter.
Dividing the second number by the first produces the value of the exit pupil, or the diameter of the beam of light reaching the eye in millimeters. (For example, both lenses, divided by 7 or 50 divided by 10, is 5 mm.)
The larger the magnification, the brighter the image, and at the same time that the image you see will be larger, your field of vision will decrease and consequently you will find it more difficult to keep the image focused.
rnIf you
choose binoculars with 10x magnification or higher, get a pair with a tripod socket so you can mount and regulate your binoculars when needed. If you need a wide field of view, choose a smaller magnification;
The higher the objective, the more light it can gather, which is important in low-light activities such as astronomy or hunting at dawn or dusk. However, the larger the lenses are, the more the binoculars will weigh. rnGenerally, most binoculars have objective lenses, ranging in diameter from 30mm to 50mm (1.18-1.97 inches), with compact binoculars with 25mm (1 inch) lenses and astronomical binoculars with lenses larger than 50mm ;
The larger the exit pupil, the more light it reaches the eyes. The human eye dilates 2-7 millimeters, depending on how light is available. Ideally, you should shoot for an outgoing pupil value that matches the width of your eyes to dilate, information which you can get with an ophthalmologist.
2. Consider the lenses
Most binoculars have glass lenses, which usually offer better image quality, but often cost more than plastic lenses. However, a set of plastic lenses that offers the same image quality as a set of glass lenses will cost more. Glass also partly reflects light falling on it, but this can be compensated with the right coating.
Lens coatings are described with the following codes: C means that only a few surfaces have been coated with a single coating layer; FC means that all other glass lens surfaces have been coated; MC that some surfaces were multilayer coated and FMC means that all surfaces of the glass lenses were multilayered. Multi-layer coatings are generally superior to individual coatings, but increase costs;
Plastic lenses, while generally of lower image quality, are more resistant than glass lenses and should be considered for situations where durability is important, such as mountaineering.
3. Evaluate eye lenses
Eye lenses should rest comfortably away from your eyes, especially if you wear glasses. It usually ranges from 5 to 20 millimeters (0.2 to 0.98 inches). If you wear glasses, you will need a distance of 14 to 15 millimeters (0.55 to 0.59 inches) or larger, as most of the glasses rest at 9-13 millimeters (0.35-0.5 inches) of the eye.
4. Comfort
Many binoculars include rubber cups around the eyepieces to help you land on your eyes when using the binoculars. If you wear glasses, look for binoculars with eye cups that retract or get out of the way. Think here in the comfort of your binoculars, as you tend to be using it for a long time.
5. Test the focusing ability
Look at how close you can concentrate the binoculars in the store and measure the distance between them and the object you are looking at.
Binoculars concentrate in one of two ways: most binoculars have a centralizing mechanism along with a diopter corrector to allow one of your eyes to be stronger or weaker than the other. Waterproof binoculars, however, usually have focus for each individual lens, with controls in each eyepiece.
Some binoculars are "unfocused," with no ability to adjust focus. These binoculars can cause eye fatigue if you try to focus on something closer than the preset distance.
6. Look at the prism design
Most binoculars have their main lenses spaced wider than the eyepieces, thanks to the Porro prisms they use. This makes the binoculars larger, but it makes nearby objects appear more three-dimensional.
Binoculars that use normal prisms leave the lenses in tune with the eyepieces, making binoculars more compact, but usually at the expense of image quality. However, normal prism binoculars can be made to deliver quality images equal to the Porro prism binoculars, but at higher cost.
Less expensive binoculars use BK-7 cushions, which tend to quad off one side of the image, while more expensive binoculars use BAK-4 prisms, which provide more light and sharper, more round images.
7. Decide how heavy a pair of binoculars you can handle
As noted, high magnification and large binoculars with large lenses weigh more than normal binoculars. rnYou can compensate for the weight and stabilize the binoculars by mounting them on a tripod or with a strap that allows you to carry them around your neck, but if you plan to travel long distances, you may want to settle for less powerful binoculars, but lighter.
8. Consider impermeability and water resistance
If you do not plan to use your binoculars in bad weather or in conditions where they get wet often, you can live with water-resistant binoculars. If you plan to take them along trails or forests, get waterproof binoculars in place.
9. Look for manufacturer's reputation and warranties
Think about how long the manufacturer is in business and what other optical products they do, if any, as well as how they will handle issues when the binoculars get damaged.
10. Search for options
Some binoculars have the ability to view images in a series of enlargements, allowing you to take a whole scene or enlarge your favorite part of it. It should be noted that as the magnification increases, your field of view will decrease and you will find it harder to stay focused on the image.
Some more expensive, high magnification binoculars include stabilizers to help you stay focused on an image. There are also binoculars with night vision option. These options make the binoculars much more expensive, but much more efficient.