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18-55mm x 1.6=


28.8-88mm


88/28.8 = 3倍
================
18-125mm x 1.6=


28.8-200mm


200/28.8 = 6.9倍
================
18-200mm x 1.6=


28.8-320mm


320/28.8 = 11.11倍
================

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