[問題] Canon 550D搭配55-250mm F/4-5.6 IS STM
我的相機是Canon 550D，最近想入手窮人三寶之一的55-250mm，
但是550D不支援STM，所以目前在考慮是要選擇IS II或是STM。
我自己比較IS II與STM，發現STM版的優點在於：
1、具備STM步進式馬達，對焦速度較快、較安靜
2、具備全時手動對焦，在AF之下無須切換也能手動調整
3、可以對焦到無限遠
4、更近的最近對焦距離(0.85M)
想請問550D不支援STM，是否就無法享有STM版的對焦優點呢?
還是有人可以直接告訴我用STM版能保有哪些優點、不能享有哪些優點呢?
麻煩大家不吝撥冗解惑，先謝謝大家了!
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