7D Preflash Problem

[Craig Hoover]

Hi All,

Please help! Does anyone know how I can disable preflashes while using the viewfinder?

When shooting through the viewfinder in manual mode, the on camera flash sends out preflashes before the shutter release. The flash does not do this when using the LCD screen. I have tried switching flash mode between Manual flash and E-TTL II when using both the viewfinder and the LCD screen. Preflashes occur with the viewfinder and no preflashes with the LCD no matter which mode I use.

I am using two YS-110a strobes set to manual 1. The pulses of light trigger the strobes which must then recycle. If I press the shutter release before the strobes finish recycling then they do not fire. The end result is either many shots that have no flash or a serious lag time between pressing the shutter release lever and being able to take the shot.

Craig

 

[bvanant]

Craig: There are two kinds of pre-flash. In E-TTL mode the preflash is to set the TTL exposure. There is another kind of pre-flash that is used to help focus. When I am using manual strobes I set the strobes to manual in the flash control menu. In custom function 3, number 11 turn off autofocus assist. Your problem should be solved.

Bill

 

[Craig Hoover]

Thanks Bill, problem solved.