relative aperture

简明释义

口径比

英英释义

例句

1.The relative aperture 相对光圈 of the lens determines how much light can enter the camera.

镜头的relative aperture 相对光圈 决定了有多少光线可以进入相机。

2.The relative aperture 相对光圈 is usually expressed as an f-number.

通常将relative aperture 相对光圈 表示为f值。

3.When shooting portraits, a wide relative aperture 相对光圈 creates a nice bokeh effect.

拍摄人像时，宽大的relative aperture 相对光圈 会产生漂亮的虚化效果。

4.In astrophotography, a low relative aperture 相对光圈 is preferred to capture more stars.

在天文摄影中，通常选择较低的relative aperture 相对光圈 来捕捉更多的星星。

5.A higher relative aperture 相对光圈 allows for better low-light performance in photography.

更高的relative aperture 相对光圈 可以提高摄影的低光表现。

作文

The concept of relative aperture is crucial in the field of photography and optics. It refers to the ratio of the focal length of a lens to the diameter of its entrance pupil. This measurement is essential because it determines how much light the lens can gather, which directly affects the exposure and depth of field of the image being captured. In simpler terms, a larger relative aperture allows more light to enter the camera, resulting in brighter images, while a smaller relative aperture restricts light, leading to darker images. Understanding this concept is vital for photographers who wish to manipulate light and focus effectively in their compositions.In practical terms, the relative aperture is often expressed as an f-number (or f-stop). For instance, an aperture of f/2.8 has a larger relative aperture than f/16. This means that f/2.8 will allow more light to hit the sensor, making it ideal for low-light conditions or when a shallow depth of field is desired. Photographers frequently use this to create a blurred background effect, known as 'bokeh,' which helps to isolate the subject from the surroundings. Conversely, a smaller f-stop like f/16 is used when a greater depth of field is required, such as in landscape photography, where both the foreground and background need to be in sharp focus.Moreover, the relative aperture plays a significant role in determining the overall quality of an image. Lenses with larger apertures tend to produce sharper images with better contrast, especially in challenging lighting conditions. However, it is essential to note that using a wide relative aperture can also lead to issues such as lens aberrations or softness at the edges of the frame. Thus, photographers must balance their choice of relative aperture with the desired outcome of their shots.In addition to photography, the concept of relative aperture is also applicable in other fields, such as astronomy and microscopy. In these disciplines, the ability to gather light is paramount, and understanding how relative aperture affects image quality can lead to better results in observations and experiments. For astronomers, a telescope's relative aperture can mean the difference between seeing faint celestial bodies or missing them entirely. Similarly, in microscopy, a larger relative aperture allows for better resolution and clarity when examining small specimens.In conclusion, the relative aperture is a fundamental aspect of optics that influences how we capture and perceive images. By mastering the principles behind relative aperture, photographers and scientists alike can enhance their work and achieve stunning results. Whether one is looking to create a beautifully blurred portrait or to observe distant stars, understanding the implications of relative aperture is essential for success in any visual endeavor.

相对光圈的概念在摄影和光学领域至关重要。它指的是镜头的焦距与其入射瞳孔直径的比率。这个测量是必不可少的，因为它决定了镜头能够收集多少光线，这直接影响到所拍摄图像的曝光和景深。简单来说，较大的相对光圈允许更多的光线进入相机，从而产生更亮的图像，而较小的相对光圈则限制光线，导致图像变暗。理解这一概念对希望有效操控光线和焦点的摄影师来说至关重要。在实际应用中，相对光圈通常以f数（或f-stop）表示。例如，f/2.8的光圈具有比f/16更大的相对光圈。这意味着f/2.8将允许更多的光线照射到传感器上，非常适合低光条件或当需要浅景深时。摄影师经常使用这个来创造模糊背景效果，称为“散景”，这有助于将主体与周围环境隔离开来。相反，像f/16这样的小f-stop用于需要更大景深的情况，例如在风景摄影中，前景和背景都需要保持清晰对焦。此外，相对光圈在决定图像整体质量方面也起着重要作用。具有较大光圈的镜头往往在挑战性照明条件下产生更清晰、对比度更好的图像。然而，需要注意的是，使用宽的相对光圈也可能导致诸如镜头像差或画面边缘柔软等问题。因此，摄影师必须在选择相对光圈和所需的拍摄结果之间找到平衡。除了摄影，相对光圈的概念在其他领域，如天文学和显微镜学中也适用。在这些学科中，收集光线的能力至关重要，理解相对光圈如何影响图像质量可以带来更好的观察和实验结果。对于天文学家来说，望远镜的相对光圈可能意味着看到微弱天体与否的区别。同样，在显微镜学中，较大的相对光圈可以在检查小样本时提供更好的分辨率和清晰度。总之，相对光圈是光学中的一个基本方面，它影响我们捕捉和感知图像的方式。通过掌握相对光圈背后的原理，摄影师和科学家都可以提升他们的工作并取得惊人的成果。无论是想要拍摄出美丽模糊的肖像还是观察遥远的星星，理解相对光圈的影响对于任何视觉工作都是成功的关键。