四支熱門 50mm 標準鏡頭評測 (轉載)
轉載自 - http://www.fotobeginner.com/306/nikon-f-mount-50mm-comparison/前言
在眾多定焦鏡中因為視覺跟人眼接近，50mm一直也是著名的"標準鏡頭"，而對於攝影近手來說50mm的定焦鏡不但價錢吸引(但新款的已開始提價)，而且有大光圈，更是"進可攻、退可守"的一種焦距，所以不失為入門的好選擇，然而現在有眾多廠商也有推出50mm的定焦鏡，那一支的質素比較好呢？新手又應該選擇那一支呢？讓我們作一次"四支熱門50mm標準鏡頭評測"！
http://www.fotobeginner.com/wp-content/uploads/2009/03/nikkor-50mm-f14d.jpg
AF Nikkor 50mm f/1.4D (以下簡稱AFD)
Lens Construction: 7 Elements in 6 Groups
Angle of View: 46 degrees
Number of Diaphragm Blades: 7 Blades
Minimum Aperture: f/16
Minimum Focusing Distance: 45cm
Maximum Magnification: 1:6.8
Filter Size: Diameter 52mm
Dimensions: Diameter 64.5mm X Length 42.5mm
Weight: 230ghttp://www.fotobeginner.com/wp-content/uploads/2009/03/nikkor-50mm-f14g.jpg
AF-S Nikkor 50mm f/1.4G (以下簡稱AFG)
Lens Construction: 8 Elements in 7 Groups
Angle of View: 46 degrees
Number of Diaphragm Blades: 9 Blades
Minimum Aperture: f/16
Minimum Focusing Distance: 45cm
Maximum Magnification: 1:6.7
Filter Size: Diameter 58mm
Dimensions: Diameter 73.5mm X Length 54mm
Weight: 290ghttp://www.fotobeginner.com/wp-content/uploads/2009/03/sigma-50mm-f14-ex-dg-hsm.jpg
Sigma 50mm F1.4 EX DG HSM (以下簡稱SIGMA)
Lens Construction: 8 Elements in 6 Groups
Angle of View: 46.8 degrees
Number of Diaphragm Blades: 9 Blades
Minimum Aperture: f/16
Minimum Focusing Distance: 45cm
Maximum Magnification: 1:7.4
Filter Size: Diameter 77mm
Dimensions: Diameter 84.5mm X Length 68.2mm
Weight: 505ghttp://www.fotobeginner.com/wp-content/uploads/2009/03/carl-zeiss-planar-t-50mm-f14.jpg
Carl Zeiss Planar T* 1.4 /50 ZF (以下簡稱ZF)
Lens Construction: 7 Elements in 6 Groups
Angle of View: 46 degrees
Number of Diaphragm Blades: 9 Blades
Minimum Aperture: f/16
Minimum Focusing Distance: 45cm
Filter Size: Diameter 58mm
Dimensions: Diameter 66mm X Length 69mm
Weight: 350g鳴謝及圖片提供：cwa
測試前先來全家福
左起：Nikkor 50mm f/1.4D、Nikkor 50mm f/1.4G、Sigma 50mm F1.4、Carl Zeiss Planar T* 1.4
http://www.fotobeginner.com/wp-content/uploads/2009/03/group1-500x144.jpg
http://www.fotobeginner.com/wp-content/uploads/2009/03/group2-500x183.jpg
http://www.fotobeginner.com/wp-content/uploads/2009/03/group3-500x216.jpg
自動對焦速度(測試相機: Nikon D3)
AFD對焦速度最快，其次是SIGMA，但只快AFG少許，ZF不設自動對焦.
由於鏡組移動幅度大，雖然設有SWM(AFG)及HSM(SIGMA)協助對焦，但對焦速度仍不及設計簡單的AFD。
拍攝角度(視角)
AFD， AFG及ZF的視角大致相同(46度， 焦距50mm鏡頭的標準視角)。
SIGMA的視角是46。8度。
以下是實際差別：
http://www.fotobeginner.com/wp-content/uploads/2009/03/view-angle-500x332.jpg
較暗的部分是ZF視角,較光及廣角的部分是SIGMA的視角。(點擊放大)
四角失光(暗角)
http://www.fotobeginner.com/wp-content/uploads/2009/03/dark-corner-500x332.jpg
参考大相由SIGMA全開光圈拍攝 (點擊放大)
注意：以下全部比較相片左起 AFD, AFG, SIGMA, ZF.
http://www.fotobeginner.com/wp-content/uploads/2009/03/aperture-14-500x83.jpg
@f/1.4在光圈全開下，暗角控制最好是SIGMA，其次是ZF。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/aperture-20-500x83.jpg
@f/2.0收至f/2.0光圈後，SIGMA已差不多沒有暗角。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/aperture-28-500x83.jpg
@f/2.8收至f/2.8光圈後，基本上只剩AFD有四角失光。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/aperture-40-500x83.jpg
@f/4.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/aperture-56-500x83.jpg
@f/5.6當光圈收至f/4.0及f/5.6，所有相片已看不到暗角。(點擊放大)
銳利度(無限遠)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-500x332.jpg
参考大相由SIGMA拍攝，選取中央部份、左下角及右下較接近中央部份(紅方框)以作比較，由於視角有差別，除中央部份外，左右下角選取大致相同位置，方便比較。(點擊放大)
中央測試
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-14-500x125.jpg
@f/1.4在光圈全開下，除AFD外，其餘三支鏡頭的銳利度很接近，其中以ZF較佳。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-20-500x125.jpg
@f/2.0收至f/2.0光圈後，SIGMA及ZF已非常銳利及對比堤升。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-28-500x125.jpg
@f/2.8 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-40-500x125.jpg
@f/4.0AFD收至f/4.0光圈才有較佳的銳利度。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-56-500x125.jpg
@f/5.6 (點擊放大)
左下角測試
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-corner-14-500x125.jpg
@f/1.4在光圈全開下，AFG及SIGMA表現接近，已有不錯的銳利度。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-corner-20-500x125.jpg
@f/2.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-corner-28-500x125.jpg
@f/2.8收至f/2.8光圈後，ZF的成像整體有了提升。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-corner-40-500x125.jpg
@f/4.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-corner-56-500x125.jpg
@f/5.6AFD收至f/5.6光圈才較貼近其餘對手。(點擊放大)
右下較接近中央
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-right-corner-14-500x125.jpg
@f/1.4 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-right-corner-20-500x125.jpg
@f/2.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-right-corner-28-500x125.jpg
@f/2.8 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-right-corner-40-500x125.jpg
@f/4.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-right-corner-56-500x125.jpg
@f/5.6 (點擊放大)
所有鏡頭的銳利度和左下角有相同表現。
銳利度(近距)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-macro.jpg
参考大相由AFG全開光圈拍攝，對焦點為杯的左眼。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-macro-14-500x125.jpg
@f/1.4 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-macro-20-500x125.jpg
@f/2.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-macro-28-500x125.jpg
@f/2.8光圈全開及f/2.0以SIGMA最為銳利，當光圈收至f/2.8後，AFG、SIGMA及ZF表現接近。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-macro-40-500x125.jpg
@f/4.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/sharpness-macro-56-500x125.jpg
@f/5.6AFD落後於其他對手，要將光圈收至f/4.0及f/5.6後才有改善。(點擊放大)
散景
http://www.fotobeginner.com/wp-content/uploads/2009/03/soft-background.jpg
参考大相由AFG全開光圈拍攝。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/soft-background-14-500x187.jpg
@f/1.4 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/soft-background-20-500x187.jpg
@f/2.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/soft-background-28-500x187.jpg
@f/2.8 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/soft-background-40-500x187.jpg
@f/4.0 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/soft-background-56-500x187.jpg
@f/5.6 (點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/soft-background-2-14-500x150.jpg
紅方框 @f/1.4 (點擊放大)
每支鏡頭有不同格，不作評論。
耀光與鬼影
http://www.fotobeginner.com/wp-content/uploads/2009/03/light-ghost.jpg
参考大相由ZF拍攝。(點擊放大)
http://www.fotobeginner.com/wp-content/uploads/2009/03/light-ghost-comparison-500x187.jpg
鬼影出現在下方。(點擊放大)
總結
AF-S Nikkor 50mm f/1.4G各方面都比舊有AF Nikkor 50mm f/1.4D優勝，但價錢便貴了大約一倍，然而面對對手如Sigma 50mm F1.4 EX DG HSM及Carl Zeiss Planar T* 1.4 /50 ZF，無論價錢及質素亦相當接近。其中Sigma 50mm F1.4 EX DG HSM個人認為可算是近年Sigma的代表作，各方面都表現出色，為重量及體積是最大缺點。 Carl Zeiss Planar T* 1.4 /50 ZF以入門ZF來說，則無論造工及質素都恰如其分。
那麼新手應該選購那一款呢? 其實"一分錢一分貨"，而且新的鏡片設計當然會比舊款進步，但價錢可能會比較昂貴，所以還是按閣下的預算來作決定吧！ 雖然測試數據顯示AF Nikkor 50mm f/1.4D比較其它3支差些少,
但如果計埋價錢,重量(230g),濾鏡呎吋(52mm)及實際日常使用效果等因素,
50.4D 仍然係一支性價比十分之高嘅優質標準定焦鏡 {:1_351:}
(全新$2000多些,二手大約$1500 - $1800) 唔計AF,一定係食菜,個種空氣感係其他牌子搵唔到. 我最後都係買左sigma~ 我用Canon 機, 所以入左Canon支50.4, 支持原廠.
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