arclen wrote:
同樣是14mm端但為...(恕刪)
這就得請教專家了.p家定焦鏡頭組成結構問題.
20mm接上變形不嚴重.14mm這顆比較看的出來
若能接受後製處理變形.應該很好用.不用退很遠就能有7-14那顆的表現
不過WM75也滿重的
這個網站有針對這兩顆鏡頭測試
其中20mm的Imgae resolution(解像力)幾乎都比14mm來的高
鏡頭中央部份 20mm從F2.5~F8 分數都比14mm高
鏡頭邊緣部份 20mm從F2.5~F11 分數都比14mm高
20mm Image resolution
14mm Image resolution
實際上這也比較符合大多數人看到的拍攝成果
然後針對這兩顆鏡頭的總評:
20mm如下:
Pros: (優點)
small, handy and with good fastness at the same time,
excellent image quality in the frame centre, including the maximum relative aperture,
=> 鏡頭中央的畫質非常優越, 包含最大光圈
good image quality at the edge of the frame, => 有非常好的鏡頭邊緣畫質
chromatic aberration well-corrected,
good work against bright light,
accurate autofocus.
Cons: (缺點)
high distortion,=>變形量大
significant vignetting.
14mm如下:
Pros: (優點)
solid but at the same time exceptionally compact barrel,
very good image quality in the frame centre,
=> 有非常好的鏡頭中央畫質(但不是20mm用的excellent字眼)
chromatic aberration well-corrected,
decent work against bright light,
negligible astigmatism.
Cons:(缺點)
monstrous distortion, =>滔天的變形量
huge vignetting,
image quality on the edge of the frame could have been better.
=> 鏡頭邊緣的畫質應該可以更好
從總結可以非常清楚看到20mm不論中央或邊緣都有比較好的解像力
這樣的測試結果也比較符合之前大多數人的使用經驗
這邊有許多大大也都推薦20mm是必買的鏡頭之一
相信不是沒有道理的~
20mm F1.7 v.s. 14mm F2.5
裡面有提供各個光圈值的照片比較~
<比較圖第一張是中央畫質 第二張是邊緣畫質>
我只列出有比較性的段落出來:
In the centre, I would say they are equally sharp. There is little to complain about in terms of sharpness at any of the aperture values.
=> 中央畫質兩顆鏡頭是一樣銳利的~對於各個光圈值都沒有什麼好抱怨的~
不過我覺得從比較圖還是看的出來20mm比較銳利~
In the corner, though, it seems that the 20mm lens is a bit sharper overall. Also, the 14mm lens has some purple fringing artifacts around the branches, which cannot be found in the 20mm corner images.
=> 在邊緣畫質,20mm鏡頭整體都比較銳利
另外14mm這顆鏡頭比較有明顯的紫邊, 但是在20mm的畫面邊緣並沒有看到
從圖看來14mm邊緣畫質已經糊掉了~
Optically, it seems that the 20mm lens still has an edge over the 14mm lens, especially in the corners.
=> 在光學上, 20mm鏡頭似乎比14mm更有優勢(edge), 特別是在邊緣畫質.
從這網站評論可以看出, 即使不計較中央畫質的差距, 20mm的邊緣畫質還是比14mm銳利~
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