[iamacanonuser]

Don't understand why ar !!!!!!

[arafeva]

the first one could well have been your pre-flash if you are using a flash gun

[p.maki]

是否你又開理防紅眼之功能?

[micros]

如果係用 ttl﹐第一下應該係閃燈測光用o既 pre-flash。
平時都係閃兩下﹐不過兩下相隔好短﹐用後簾時第二下遲好多先閃﹐先睇到係兩下。