Flash Optical slave question - help needed

Joined
Jan 18, 2012
Messages
195
Location
UK
Up until recently ive always used Yongnuo flashes and sometimes on jobs rather than using wireless triggers for the remote flashes I just set them to optical slave mode and allow the on camera flash to activate them.

Since buying my SB700 this no longer works (using the SB700 on camera and the yongnuos off camera), the flashes do fire, but they arent in sync with my shutter so they are either firing slightly early or slightly too late (I cant decide which).

Ive looked the obvious such as shutter speed etc but nothing seems out of the ordinary. Can anyone help me out here?
 
Joined
Nov 21, 2012
Messages
186
Location
Singapore
Hi,

Is the SB700 on manual or A mode ?
If the SB700 is on i-TTL, it will do a "double flash", causing the optical slaves to fire too early.

Hopefully this helps ....
 
Joined
Jan 18, 2012
Messages
195
Location
UK
That must be it, the yongnuo has 2 slave modes and is supposed to pick up the pre flash, which it does with other yongnuos, but I guess it's not working so well with the sb700. I'll give that a try, thanks for the reply :)
 
Joined
Apr 3, 2006
Messages
5,615
Location
Texas
There are a few modes. If the SB-700 is in Commander mode (called Master mode, SB-700 manual page D-6), it cannot trigger any optical slave in sync. Too complex, totally incompatible with optical slaves. It expects to be communicating with intelligent remotes, not dumb slaves.

Otherwise, the Yongnuo two slave modes are supposed to handle Manual flash or iTTL flash (SB-700 manual pages C-3 and C-7). No bets though, I don't have them to really know, but that is the idea.
 
Joined
Feb 13, 2012
Messages
586
Location
Atlanta, GA
Yongnuo has two slave modes for the optical sensor on their flashes.
S1 is "instant" optical slave - the flash will flash as soon as it "sees" another flash - including pre-flashes. It's used when you are doing manual flash on your master flash.
S2 is also called “pre-flash cancel mode”. This mode is similar with S1 mode, but it can ignore the pre-flash given by TTL flash. Therefore, it can support the main flash working in TTL mode. If you cannot use S1 without it going off early, then try to use S2 mode.
 
Joined
Jan 18, 2012
Messages
195
Location
UK
I know I ran into this issue when I first got them when using the 565 as the master but it seems in either mode they wont work with the SB700, its very strange but I can live with it, it just means ill rely more on the triggers :)
 
Joined
Feb 13, 2012
Messages
586
Location
Atlanta, GA
Manual triggers are cheap. If optical is not reliable for you, then swap over to something that is.
 

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