7D's built-in flash can work as a master unit to wirelessly trig

來源: 於 2012-12-29 18:29:23 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

However, it is an optical trigger that requires direct line-of-sight.

600ex-RT and other radio triggers such as PW use radio signals, which is much more flexiable.