日期:99年8月11日                                           =風格檔:=

原文作者: kt846 梁大叔的光影世界

使用器材:X

經過了四年之後,終於在今天把變焦三元與定焦四寶搞定了!在這四年之間,不斷的找尋自己拍照的風格與適合自己的裝備。

定焦四寶VS變焦鏡皇PK戰 <二>




繼上篇PK戰後,本篇將以EF 50mm F1.4來PK EF 24-70mm L 的50端,以及EF 85mm F1.8 PK EF 70-200mm L的85端,看看在同樣的光圈下,非L級的大光圈定焦鏡與L級恆定大光圈變焦鏡兩者之間的成像差異,或許會讓各位Canon愛好者能更了解L變焦的價值、與非L級定焦鏡的高性價比。

另外,定焦四寶與變焦二皇的比較純粹是提供各位攝影愛好者一個參考的依據,這個比較不是絕對值。變焦定焦各有所長,人有所好,拿定焦鏡與變焦鏡PK或許有失公允,但這個比較測試的初衷就是要讓各位同好了解:為何定焦鏡的素質是贏過變焦鏡的。

首先是EF 50mm F1.4 USM 對上 EF 24-70mm F2.8 L USM:

50/1.4  全開光圈 F1.4  明顯的紫邊現象,不過50/1.2 L 的全開光圈紫邊現象也是不遑多讓。但是喜歡大光圈淺景深的同好,對這顆標準定焦鏡是愛不釋手,是值得購入的隨身鏡頭之一。

 

50/1.4  光圈F2.8  在光圈縮到F2.8之後,紫邊狀況已經明顯的降低許多,整體畫質已經達到90分以上,所以想使用這顆定焦鏡拍出淺景深卻仍擁有較高畫質的畫面,建議使用F2-F2.8的光圈設定

 

24-70 L  50端全開光圈F2.8  可以看見標準鏡皇在全開光圈下仍有明顯的紫邊狀況,在這個F2.8的光圈值比較下,定焦鏡畫質可說是明顯領先。

 

50/1.4  光圈F5.6  在縮到F5.6後,這顆定焦鏡的畫質可說是無懈可擊,推估50/1.4這顆定焦鏡的最佳畫質在F4-F5.6之間已經出現。

 

24-70L  50端光圈F4  這是唯一錯誤的測試設定值(應該是要測F5.6才對),不過仍然可以拿來參考一下,鏡皇在F4的設定下,勉強與50/1.4在F2.8時才有相同的表現,再次驗證定焦鏡素質可以贏過L變焦鏡。

 

50/1.4  光圈F8

 

24-70L  50端光圈F8  兩者的畫質已幾乎是同樣等級。

 

50/1.4  光圈 F14

 

24-70L   50端光圈F14

 

標準鏡皇與28/1.8、50/1.4 測試小結:
從 以上28/1.8、50/1.4與變焦鏡皇的正面對決之後,各位C家攝友可以清楚的從結果看見廣角與標準定焦鏡在影像的品質上面,整體表現還是超越標準變 焦鏡皇,不過定焦鏡的鏡片數量比起鏡皇少了許多,結構也比鏡皇簡單;光線通過越少的鏡片、越能減少對影像的干擾、越能提高光線的行進效率,所以畫質更能明 顯提升。

以50mm定焦鏡頭來說,業界普遍使用”變型雙高斯”這種設計手法,以對稱的兩組鏡片來降低全開光圈時的各種像差影響,而這種鏡頭結構又使用少數幾片鏡片,自然對畫質的減損達到了一定標準。

早期徠卡鏡頭的鏡組設計,即是使用了雙高斯結構,對比EF50/1.4,可說是標準定焦鏡頭結構的始祖。

EF 50mm F1.4 的鏡片結構,即是由早期雙高斯結構演變而來的變型雙高斯結構,目前變型雙高斯結構的專利登記已有四百種左右,未登記的更多。

此文經作者同意轉文出處 http://www.wretch.cc/blog/kt846/13808760

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