Re: [選購] Eos M2長焦鏡頭選擇(canon三種對焦馬達比較)
: USM是"全時手動對焦",對焦環和馬達可以同時帶動鏡片,互不影響,
: (我猜裡面應該是有差速器)
: 任何時候都可以轉對焦環
: AF/MF鈕用來啟動/停用機身AF功能
這裡錯了
USM是超音波對焦馬達Ultrasonic Motor ≠全時手動對焦
全時手動對焦是FTM Full-Time Manual
USM裡面又分環形超音波馬達(Ring-type-USM)跟 微型超音波馬達(Micro-USM)
而USM多半附加FTM功能
而有無例外沒有支援FTM的就沒有仔細查過了
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