[cocoho]

我是新手...剛買350d.發現開了閃光燈後,在對焦時閃光燈.閃了幾下...
是否正常???

[peterchan04]

正常... 閃光燈閃了幾下... 是要 先 測光. 小心看明書.

[Philippe]

應該是用來輔助對焦的.

[peterchan04]

1. Under very LOW light... yes... the pre-flash could be used to help focus

2. BUT... most of the time....
"The flash exposure is computed using the preflash burst, which is output a fraction of a second before the full flash...."

http://photonotes.org/articles/eos-flash/#controlling