回复：Johnfan

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.

所有跟帖： 

• Zeiss is certainly a better lens. Is it $250 better? -johnfan- ♀ (53 bytes) () 12/02/2009 postreply 15:00:33

• your replacement cost would be more than $250 -Able- ♂ (60 bytes) () 12/02/2009 postreply 19:16:59