How to choose binoculars?

Binoculars are an important and indispensable tool for every outdoor enthusiast. However, many friends do not have much knowledge about the performance of the binoculars and how to choose a binoculars, so the purchased binoculars have not been used much or the effect is not satisfactory. Here, we will introduce to you how to choose binoculars, the content is as follows:

1. Types of binoculars

Binoculars can be divided into two categories: Porro Prism and Roof Prism. The structure of the porro type binoculars (https://tontubeoptics.com/products/nikula-camouflage-binoculars-7x50-10x50-bak4-fmc-lens-hunting-binocular-telescope-for-adults) is simple, and the light transmittance is higher than that of the roof type of the same level. Because the distance between the objective lens is wider, the image has more three-dimensional; and because the process requirements are lower, the price is generally cheaper. The roof type binoculars (https://tontubeoptics.com/) is relatively complex in structure, requires higher precision, is not easy to develop, and has higher cost and selling price; the two sets of prisms are aligned in a straight line to make it smaller in size, better in hand feeling, better in sealing performance.

2. Optical performance

(1) Magnification (preferably between 8 times and 10 times)

The binocularss are marked with words such as 10 x 42, 8 x 32, etc., the former represents the magnification, and the latter represents the diameter of the objective lens. Using a 10x binoculars to see a bird standing at 100 meters is as close as seeing it with the naked eye at 10 meters. The larger the magnification, the smaller the angle of view, making it more difficult to search for targets, and it is easier to affect the clarity due to trembling hands. When the light is very sufficient, 10 times is clearer than 8 times; when the light is insufficient, 8 times can see more details than 10 times, so you should not blindly pursue high magnification.

(2) Objective lens diameter (should be between 28mm and 42mm)

The larger the aperture, the better. The diameter of the objective lens affects the amount of incoming light. Especially in the case of strong light-dark contrast, dawn and dusk, and cloudy conditions, the larger the aperture, the higher the amount of light entering, and the eyes can see more details; but at the same time, the heavier the binoculars, the more likely to cause fatigue when watching for a long time. It is advisable to choose a larger lens according to your physical ability.

(3) Field of view (the bigger the better)

The field of view refers to the range that can be seen from 1000 meters, and the width of the field of view should be higher than 104 meters, which is 6 degrees. The larger the field of view, the faster and easier it is to search for targets. However, the larger the field of view, the more serious the distortion and blurring of the edges, the more complicated and difficult the correction of aberrations, and the higher the technology and cost required.

(4) Color fidelity (the more natural the better)

High-quality binoculars must faithfully reflect the original color and color saturation of the scene. In order to increase the brightness of the binoculars, some manufacturers deliberately increase or decrease a certain section of light waves, resulting in distortion and making the scene appear blue or reddish.

Light transmission is closely related to coating and directly affects color fidelity. All optical glass has high light transmittance and multi-layer coating on the entire surface, with relatively high brightness and accurate color reproduction. Generally, manufacturers will not publish all the data (it is difficult to do), and some manufacturers will publish the light transmittance or coating of partial optical glass to mislead consumers.

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