[EOS1000]

尋晚試下部350D個閃燈後簾同步, 發覺佢會閃兩次(一頭一尾)!
據我所知, 後簾同步應該係收shutter之前發出閃燈, 咁點解會有第一下閃呢?

朋友部350D都係一樣, 會唔會係E-TTL既預閃測光呢?
thanks.

[tyuen]

Yes, the first one is pre-flash.

[EOS1000]

thanks.

如果係pre-flash, 即係未開shutter之前既flash?
但係第一下閃同第二下閃強度差不多, pre-flash唔係應該好弱架咩?

[tyuen]

>>如果係pre-flash, 即係未開shutter之前既flash?
Yes.

>>但係第一下閃同第二下閃強度差不多, pre-flash唔係應該好弱架咩?
I don't know, especially the power of your real flash. Perhaps the pre-flash shall be strong enough for an effective range for metering. As such, it cannot be too weak.

[EOS1000]

I see.
Thanks a lot, tyuen!!