讓你猜,照這兩個圖的鏡頭的前玻璃多髒
1
2
有這麼髒
http://www.lensrentals.com/blog/2008/10/front-element-scratches
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As you can see, scratches and lots of dust in a lens may cause loss of contrast, loss of light gathering, and lens flare, but even so, will not be visible on the image. (In fact, our guess is most of the lost sharpness is because the optical element shifted when it broke, rather than from the cracks themselves.) Dust on the sensor may show up on an image, but a bit of dust within the lens or scratches on the front element really aren’t something to worry about.
正如你所看到的，划痕和大量塵埃的鏡頭可能導致喪失相比之下，集光損耗，鏡頭光暈，但即便如此，也不會在圖像上可見。 （事實上，我們的猜測是最失落的清晰度是因為光學元件移動時它打破了，而不是從裂縫本身。）灰塵對傳感器可能出現在圖像上，但鏡頭中的一點灰塵或前玻璃的划痕確實沒有什麼可擔心的。
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