回复：This is what one of my friends uses.

来源: 于 2012-01-07 14:06:57 [旧帖] [给我悄悄话] 本文已被阅读：次

http://www.bhphotovideo.com/c/product/514614-REG/Kenko_KFM_1100_KFM_1100_Auto_Digi_Meter.html

But e-TTL2 or i-TTL was designed to do just exact what you want to do.

Best regards,

Alex