Nikon ais 20mm F2.8 On a 24MP FX Nikon D3X
At f/2.8
Everything is a little soft and dreamy, veiled by spherical aberration.
The corners show a healthy dose of coma.
At f/4
The spherical aberration is gone from the center, which is now sharp and contrasty.
The sides and corners are softer, and the corners show coma.
At f/5.6
The sides perk right up, and are now sharp and contrasty.
The corners are still softer.
At f/8
The corners improve further, and the center is optimum at f/8.
At f/11
The corners are optimum at f/11, while diffraction only slightly reduces center sharpness.
結論的部份說到，ais的成像應該是與AF版本的近似，我覺得相較而言Voigtlander F3.5時略勝Nikon af 20mm f4 的表現，當然F2.8是無可取代的，如果需要大光圈就挑Nikon，成像上就挑Voigtlander。
還有其他的review可以參考有實拍的圖momentcorp
相機的能量，來自於人的力量；相機的質量，來自於小朋友的數量。
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