On Thu, 8 Jul 2004 Fred Miller wrote: > On Thursday July 8 2004 3:08 pm, Simon Rose wrote: > > Hi, > > > > I have recently purchased a Sto-Fen Flash Diffuser to > > go with my Sigma 500 Super flash gun and EOS300/ 30 > > bodies. Has any one else used these before and care > > to part with any hints and tips?
<snip> > > Also the Canon flashes say they have a pre-flash for > > the metering system but I can't detect on with the > > Sigma - or is it too quick for me to see? Hi Simon, In most cases it's too quick to notice. The preflash occurs between pressing the shutter and the lifting of the mirror. The main flash fires when the shutter opens. Pretty close, although some people can detect the 2 firings. One way to detect it is to set rear curtain sync and use a slow shutter speed. The main flash only fires as the shutter is about to close. > > Often it is, but it also is dependant on ETTL, if believe, > and if the lens isn't 100% ETTL compatible, then functionality > will be diminished. Hi Fred, Isn't this the case for E-TTL II, not for the original E-TTL? The new version uses the distance information provided with some lenses (mostly ring USM) and reverts to standard E-TTL with other lenses. Standard E-TTL uses the pre-flash. E-TTL II uses both pre-flash and distance info from the lens where available. Distance info is not used when the flash head is tilted, or for macro. I don't believe it's used with multi-flash wireless setups either. Cheers Gary This message has passed through an insecure network. Please direct all enquires to the message author. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
