Sony 50mm f1.4 (SAL-50F14) 鏡頭測試後的疑問?

前面兩張用 SAL-50F14 拍. 最後一張用 SAL-1870. 發現 SAL-50F14 對焦好像往後飄一點點? 不知道你們看會嗎?

Exposure: 0.033 sec (1/30), Aperture: f/1.4, Focal Length: 50 mm, ISO Speed:100
SAL-50F14

Exposure: 0.5, Aperture: f/5.6, Focal Length: 50 mm, ISO Speed: 100
SAL-50F14

Exposure: 0.6, Aperture: f/5.6, Focal Length: 50 mm, ISO Speed: 100
SAL-1870