景深跟距離無關

來源: 於 2012-09-14 05:09:51 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

For example, if you take a photo with 100mm focal length at 10m away, then, with 200mm focal length, to take the same photo (same field of view), you will be at 20m away.  And in these two cases, the depth of field is essentially the same.