lens/tamron/SP AF17-50mm F2.8 XR Di II のバックアップ
2014-03-26 (水) 08:52:01 のバックアップ（No.172）
*SP AF 17-50mm F/2.8 XR Di II LD Aspherical [IF] (Model A16)
http://www.tamron.co.jp/lineup/a16/index.html
35mm判換算で焦点距離26-78mm相当をカバーする、APS-Cサイズ版[[28-75mm/F2.8>lens/tamron/SP AF28-75mm F2.8 XR Di]]とも言えるレンズ。APS-C専用とすることでズーム全域でF2.8ながら小型軽量を実現した。自重落下を防ぐズームロックや0.27mまで寄れるのもポイント。ズームリングの作りが良いのか、ズームロックを使わなくともあまり自重落下しない((ただしこれは個体差の可能性もある。))。
逆光性能も悪くは無いが、太陽などの強い光が直接上方向から入ると派手なゴーストが出ることがある。
[[キットレンズ>http://wiki.a-system.net/index.php/lens/minolta/dt/AF%20DT18-70mmF3.5-5.6%28D%29]]と比べ以下のような利点がある。
・F2.8通し
・17mmからスタート
・フォーカスリングが広く操作しやすい
・フードの作りがまとも
ただし、写りは値段なりでワイド側の周辺画質には期待できない。
しかしキットレンズと比べた場合の利点も多いため、初めてデジタル一眼レフを購入するなら今のところおすすめレンズということに変わりはない。
フィルタ径：67mm 絞り羽根：7枚 (円形絞り)
**作例
+&example(478){α100 17mm f8 ISO100}
+&example(486){α100 35mm F3.5 ISO400}
+&example(712){αSweetD 17mm F11 ISO200}
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