參考:Lens Speed
===以下為更新內容===
很抱歉,我稍早沒發現 Wiki "Lens Speed" 這篇文章已經被引用。來補一個新的。
以下連結是 Ken Rockwell 對 Nikkor 50mm f/1.2 AI-S 的分析 (無 AF 的鏡頭)。其中有一句提到:"This is Nikon's fastest lens currently in production."
http://www.kenrockwell.com/nikon/50mm-f12.htm
www.flickr.com/photos/jouisue
Kavinchang wrote:
小弟的心得是, 1....(恕刪)
G 會較快嗎?
小弟沒有 D3s, 只有試過同事的 D3 及自己的 D700 分別以 1.4D 及 1.4G 來測試
怎麼都是 1.4D 快很多

D700+N14-24+N24-70+N24G+N50G+N85 f1.4D+SB900
春光乍洩 wrote:
感謝您的指教不過如果...(恕刪)
Oh c'mon man! What's the big deal? Everyone makes mistakes.
Just put down your pride and let's face it, bro! It's a common sense yo!
The word "Speed" in Photography always refers to "Shutter Speed".
You want your shutter to be super fast, you gotta have one of those "Big Aperture" lenses, you dig?
If you don't believe us, you can go ask anyone in Flickr or Dpreview forum.
Peace!
春光乍洩 wrote:
請恕小弟眼拙遲鈍這一...(恕刪)
春兄,辛苦!
不過,在英文常會有該專門領域的專業慣用語,不熟悉常會雞同鴨講,搞錯原意!
在攝影領域,談到速度都是指可以穫得高速快門速度的意思,因此像大光圈鏡頭都會用快速鏡頭來表示,因為在同一場景可以獲得更快的快門能力!
the fastest AF standard lens最大光圈的標準鏡頭
You have to pay almost a threefold premium over the AF 50mm f/1.8 D for the extra gain in speed but then there's no real substitution for speed but more speed.
相對於50 1.8來說,1.4的不能贏得太大快門速度,但為此你就必須得付出將近三倍左右價差!
這裡是在講大光圈的低性價比問題!
提對焦速度對於這種af-d鏡是沒有意義,那個是要看機身等級,1.8d在d2h等級就暴力,和在d70就是差很多!
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