鏡頭選擇問題請益
小弟之前接手家人的Nikon D90，目前手上有
nikon 18-200mm vr 一代，
tokina 11-16mm 二代
這兩顆鏡頭，最近再拍的時候，對於旅遊鏡的畫質稍微沒那麼滿意，就想起當初再研究鏡
頭的時候，對於sigma 17-50mm f2.8的恆定光圈，發色，銳利度 非常的心動，只是說這
個焦段跟18-200mm重疊到，所以想上來問看看大家的意見，值得入手這顆鏡頭嗎?
預算大概1萬上下，如果要入手可能會考慮二手的
謝謝大家
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