Olympus 14-54 變焦後會走焦的大問題

edwardwong 發表於: 2008-10-15 20:24 來源: 攝出中國

14-54 的大問題突然發現1454 如先鎖對焦, 再變焦, 焦點就走了. 但1122沒有這樣.

變焦後會走焦的鏡頭應該是比較低檔的zoom鏡頭才有的.....

[ 本帖最後由 edwardwong 於 2008-10-18 17:31 編輯 ]

最新回復

hardy at 2008-10-15 21:45:39: 變焦後會走焦的鏡頭多的是~~~
edwardwong at 2008-10-18 14:05:20: 有這問題, 在做陷阱對焦時按畫面變化的影響很大.
edwardwong at 2008-10-18 17:27:28: 其實 1454 不是 zoom 鏡, 而是 Varifocal lens

wiki 百科: http://en.wikipedia.org/wiki/Zoom_lens
Varifocal lens

Many so-called "zoom" lenses, particularly in the case of fixed lens cameras, are actually varifocal lenses, which gives lens designers more flexibility in optical design trade-offs (focal length range, maximum aperture, size, weight, cost) than true parfocal zoom, and which is practical because of auto-focus, and because the camera processor can automatically adjust the lens to keep it in focus while changing focal length ("zooming") making operation essentially the same as a true parfocal zoom.[2]