Report copyright - 镜头 EF-S17-55mm f/2.8 IS USMgdlp01.c-wss.com/gds/0/0300003570/02/efs17-55f28isusm-im3-chi.pdf焦距/光圈 17-55 mm f/2.8 镜头结构 12组,19片 最小光圈 f/22 视角范围
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