回复：Johnfan

来源: 于 2009-12-02 11:58:00 [旧帖] [给我悄悄话] 本文已被阅读：次
I am using Sony A300. I do not think I will upgrade to full frame in the near future. My Sigma 17-70mm only costs about $350. For $250 more I can get Zeiss SAL1680Z. But I am not sure it will be a such improvement.