[問題] 相同焦距不同鏡頭測光值問題
請問同焦距,不同鏡頭測出來的光會不一樣正常嗎?
我現在的狀況是在同一場景(在多個地點測試也差不多是同樣情況)
機身:nikon d750
鏡頭A:35mm 相機設定A模式在 iso:100 光圈:f4, 快門會給出:1/200秒
鏡頭B:17-35mm 放在35mm端,相機設定同上,這時快門會給出:1/360秒
看直方圖與照片,確實鏡頭B是暗了0.7~1ev左右,
將鏡頭B手動調成1/200秒(或ev+0.7~1.0),此時直方圖會與A接近
總共試了三支鏡頭
nikon 20mm f1.8 曝光正常
tamron 35mm f1.8 曝光正常
sigma 17-35mm f2.8~f4 放在20mm 和35mm時都會少0.7~1.0ev
是很多鏡頭都會有類似的問題嗎?是不是也只能用這類的鏡頭時就先設好+0.7~1ev?
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