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一个变焦镜头在一个焦点段的锐度和十月21日拍的月亮（修改版）

(2024-10-26 10:48:35) 下一个

一个变焦镜头在一个焦点段的锐度和十月21日拍的月亮（修改版）

先得谢谢位酷哥，位酷哥让我找我的镜头的锐度，没他的帮助是不可能有这篇文章的。

什么是锐度：

Google的AI回答：

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"Sharpness of a lens" refers to the ability of a camera lens to capture fine details in an image, meaning how crisp and clear the subject appears, with a sharp lens producing distinct edges and textures, while a less sharp lens might result in blurry or soft details; it's essentially a measure of the lens' resolution and is often judged by how well it can render fine lines and patterns across the entire image frame, from the center to the corners.

单焦镜头的锐度只有一个:

For most lenses, sharpness in P-Mpix is typically between 50% and 100% of the sensor pixel count, and differences smaller than 1 P-MPix are usually not noticeable. The best resolutions are usually achieved by prime lenses at apertures between f/2.8 and f/8.

变焦镜头的锐度在不同的焦段是不同的：

Google的AI回答：

In a zoom lens, sharpness typically varies across the zoom range, with the best sharpness usually found in the middle of the zoom range, while the extreme wide and telephoto ends tend to be slightly softer; this means a zoom lens is often not as sharp at its maximum zoom as it is at a middle focal length, and is generally considered less sharp than a prime lens with a fixed focal length due to its complex internal mechanics.

For a zoom lens, the aperture at which you find the best sharpness at a specific zoom range is usually not fixed across the entire zoom range; most zoom lenses have a variable aperture, meaning the maximum aperture changes as you zoom in or out, so you may need to adjust your aperture depending on the focal length you're using.

位酷哥建议我用ISO12233去查锐度。

我刚刚从aliexpress order了一个，还没接到：