The first step in choosing a pair of binoculars is to determine the power you want. The power of binoculars is represented by two numbers, as in the following example: 6×24, 7×50, 8×42, 10×42 and 12×36. The two numbers are not directly related, the first shows the magnification and the second determines the objective lens diameter.
The first number, which is always the smaller of the two, reveals the amount of magnification that enables binoculars. This is an indication of how much closer the image will be visible when being looking through binoculars. The first assumption is not true that choosing a larger number will benefit because elections enlargement should see the target and terrain that will be used.
Lower-magnification binoculars usually use 7x enlargement and lower-allowing for a wider field of view which targets far-away objects like animals, ships, or birds. Wider field of view also makes it easier to follow the movement of the object being observed. Since the low magnification binoculars take in more of the scene, they gather more light. Consequently, the resulting picture will usually be easier to see and bright though not as greatly exaggerated. Because enlargement is reduced, it also tends to be less sensitive to movement or vibration. If you intend to be in the field of utilizing your binoculars without a tripod, this could be an important consideration. Lastly, lower magnification binoculars are usually able to focus on objects closer than comparable binoculars with higher magnification.
But, of course lower magnification binocular allows for less magnification, and consequently reduces the detail when compared to the higher magnification models. If you really want a high magnification binoculars, typically 11x and above, you should make sure you can get an extra tripod or get binoculars with image stabilization. The greater the magnification, the more influence to the binoculars in a matter of vibration. Once you start thinking about 10x magnification binoculars, binoculars of this kind would be virtually unusable without image stabilization system or a tripod. So, if you plan on using the binoculars of this type for a long period of time, a tripod may be more convenient option to get image stabilization.
As for the cost, it is perhaps not surprising that the higher magnification models tend to be more expensive than equivalent lower magnification binoculars. Unless you really want or need a high magnification binocular, the number of middle-of-the-road kind is 8 x magnifications. Binoculars at the level of an enlarged view of the intermediate create good view while providing a low weight, good brightness, and a reasonable cost.
Objective Lens Size
The second number in power is according to the diameter of the objective lens in millimeters (mm). The smaller objective lens usually shows the smaller overall size.
Binoculars with a size of 30 mm objective lens are usually found at the bottom of the pocket and compact models. While pocket and compact binoculars tend to be lighter and easier to carry, the downside to reduced lens size is that smaller lens allows less light produced by binoculars. It can produce a dark image, something that is more difficult to see. If you intend to use your binoculars in the evening, a model with smaller objective lens will not be a good choice. In night use or in the situation where the brightness is critical, objective lenses that are 50 mm or larger will work better for you. However, binoculars with a large objective lens will most often be large and heavy. If you are going to use binoculars that have large objective lens, you definitely need to have an independent tripod.
The size of the objective lens that is most often used is between 35 and 50 mm. Because of the magnification level also affects the brightness of the image), the size of the objective lens tends to increase with increasing magnification compensating the brightness lost. As a good general advice, you should choose binoculars that have a diameter of the objective lens that is at least 5 times greater than the magnification. For example, 6×30, 8×40, 12×60, etc. Although there are several manufacturers of binoculars equipped with very well optical that can produce excellent brightness at a ratio below 5, the safest thing for us is to stay at or above this ratio for good brightness.
Binoculars for bird watching for bird watching, you should consider the three important considerations below:
Practicality and speed focusing
To observe fast-moving subject, you will require practicality and speed in the hands of focusing an object. This is because there is plenty of time to observe the birds in flight quickly. So if the focusing process is not fast, you will lose the moment.
You should ensure the focus wheel working intuitively as simple as possible to achieve the quickest and best focus. Observers will slowly approach the maximum sharpness of focus which will then return if the wheels are beginning to blur the focus. The wheels should spin smoothly from beginning to end of the round. If there are irregularly changes (stepping) of the process of image sharpness changes (focus), the overall quality of the binocular is certainly questionable. Wheels should not be hard to focus when rotating, and has a non-slip surface, so that the fingertips can provide appropriate feedback on the information provided by the brain. Focus wheel must also be sufficiently large and easily achieved by the fingers although using gloves.
Most binocular use tooth focus at a constant speed, in addition to a small number of teeth binoculars that has the focus at different speeds at the focusing ending, but this is not very common. However you might consider some focusing mechanism adjustments when choosing bird watching binoculars with camera.
Focusing with a high gear ratio
You should use a high ratio that has a range of wheel spin which less than 360 degrees to focus the closest distance to the farthest distance. This kind has the benefit that lies on faster focusing process because of the range of wheel rotation is less than 360 degrees. This is useful in situations requiring rapid changes in focus, for example, the time to see birds in large quantities in different distances on the beach or at the lake. The drawback lies on the fact that this binocular is difficult to be controlled by our fingers when turning the wheel and stopped at the right time, to get the image focus.
Focusing with a low gear ratio
Binocular with a low gear ratio has a range of wheel spin which more than 360 degrees to focus the closest distance to the farthest distance. The advantage of these binoculars is our fingers will easily find the appropriate focal point (micro adjustment) so as we can produce a sharp image, without having to turn the wheel back and forth the main focus. It is useful to observe the birds that are flying alone, or who are perched in a tree or on the ground. The drawback of course the focusing process is slow because it must turn the wheel in quite large rotation angle ranges.
Focusing with medium gear ratios
Binocular with a low gear ratio has a range of wheel rotation between one-half to two rounds of the closest focusing distance focus to the farthest distance. This is the most favorite binocular kind chosen by birdwatchers, because it is not too difficult to get the right focus and doesn’t need too long time to focus on objects at different distances. To get a better insight about bird watching, you can get more info here http://www.atncorp.com/smart-hd-binocular.