>It is possible to use flash triggered exposure meters with ETTL, but what >you need to do is to make use of the 10 second camera delay facility thus >giving you time to switch the flash meter "on" after the pre-flash, which >fires at the start of the 10 seconds, and before the taking flash. OK for >still life, but a bit useless for portraits! > >M Stewart Milton Keynes, UK
Good trick but unfortunately doesn't (always) work if you have more than one (E-TTL) flash. I have made some tests with flash in M-mode and master switch at 'master' and 'off'. It seems that to trigger the slave flash(es) a preflash of about 1/64 power is used (because when I used a single flash at 1/64 power and master switch at 'master' the flash meter showed 1 stop more light than with master switch at 'off'). Right? At manual output powers of 1/8 or higher the effect of the preflash was not significant (maybe 1/3 stop at 1/8 power). On the other hand, why would you use E-TTL and flash meter at the same time? If you need speed and flexibility (e.g. moving object) then forget the flash meter and use (E-)TTL. If you use flash meter then your flash can be in manual mode and you are in full control. My opinion is that flash meter and Canon wireless flash system with more than one flash are useless together (especially at low output power levels). Vesa _________________________________________________________________ Join the world�s largest e-mail service with MSN Hotmail. http://www.hotmail.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
