[問題] Sigma 17-70升級17-50
目前用 500D + 二代 S 17-70 f2.8-4 OS + 430EX II。
S 17-70 算是我從18-55升級的鏡頭蓋
，而最近看到 Sigma 17-50 大跳水，有點衝動想換新鏡。
如果室內恆定光圈可以目前430EX II閃燈來補足;那以兩者畫質為考量的話，是否有升級必要?
想徵求版友意見，謝謝!
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