Relationship between objective lens size and light transmittance: Why is 50mm more suitable for dusk hunting than 32mm?

Relationship between objective lens size and light transmittance: Why is 50mm more suitable for dusk hunting than 32mm?

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Among the parameters of a rifle sight, the size of the objective lens is one of the key factors affecting its performance. Especially in a hunting scene with complex lighting conditions like dusk, the relationship between the size of the objective lens and the light transmittance is particularly important. So, why is a 50mm objective lens more suitable for dusk hunting than a 32mm objective lens? Let's conduct an in-depth analysis from the perspectives of optical principles and practical applications.

 

The optical principle of objective lens size and light transmittance

The main function of the objective lens is to collect light and transfer it to the eyepiece, enabling the shooter to observe the target clearly. The larger the diameter of the objective lens is, the larger the area for collecting light will be. According to optical principles, the amount of light collected is proportional to the square of the objective lens diameter. For example, the light collection area of a 50mm objective lens is approximately 2.44 times that of a 32mm objective lens (calculated as: (50²÷32²) ≈ 2.44). A larger light collection area means that more ambient light can be collected, thereby increasing the light transmittance of the sight.

 

In an environment like dusk where the light is relatively weak, sufficient light entering the scope is the key to ensuring a clear field of vision. The 50mm objective lens, with its greater light collection capacity, can capture more faint light, making the target brighter and clearer in the field of view of the scope. In contrast, the 32mm objective lens collects relatively less light. In the low-light environment at dusk, it may result in a darker field of view and make it difficult to see the details of the target clearly.

 

Performance differences in actual hunting scenarios

Target clarity

When hunting at dusk, using a 50mm objective scope, the shooter can see the outline, coat color and other details of the prey more clearly. This is crucial for accurately judging the type and condition of the prey and finding the appropriate shooting position. For example, when observing a hare active in the grass at dusk, a 50mm objective lens can increase the contrast between the hare's figure and its environment, making it easier for the shooter to spot and aim at the target. However, the 32mm objective lens, due to its relatively low light transmittance, may make the image of the hare appear blurry, increasing the difficulty of aiming.

Field of view and light uniformity

In addition to enhancing the clarity of the target, the 50mm objective lens also has advantages in terms of field of view and light uniformity. A larger objective lens can offer a broader field of view. When hunting at dusk, shooters can observe their surroundings more comprehensively. Not only can they better spot their prey, but they can also promptly detect potential dangers or other interfering factors. Meanwhile, the 50mm objective lens collects a larger amount of light, which can achieve more uniform illumination within the field of view, reducing visual fatigue and aiming errors caused by uneven light. The field of view of a 32mm objective lens may be relatively narrow, and the uniformity of light is slightly poor. In a complex dusk environment, it may affect the shooter's observation and judgment.

Adapt to changes in light

At dusk, the light changes rapidly, from relatively bright to gradually dim, which may occur only in a short period of time. The 50mm objective lens, due to its high light transmittance, can better adapt to such changes in light. During the process of the light gradually weakening, the shooter can still maintain a clear observation of the target through the 50mm objective scope, without the need to frequently adjust the brightness setting of the scope or take other auxiliary lighting measures. However, when the light weakens, the 32mm objective lens may soon fail to provide a clear enough field of view, limiting the hunting time and effect of the shooter at dusk.

 

The size of the objective lens is closely related to its light transmittance. In the scene of hunting at dusk, a 50mm objective lens has obvious advantages over a 32mm one, thanks to its higher light transmittance, better target clarity, wider field of view and stronger adaptability to light changes. Therefore, for shooters who often hunt at dusk, choosing a 50mm objective scope can significantly enhance the hunting experience and success rate.

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