Not exactly. The e-ttl meter will measure the totality of the light and determine what is necessary to create the middle tone exposure (fec at 0) . This will require a little more power from the 420 since the Sigma has been diminished, but no more than would be required if the Sigma was dialed down anyway. Where you will waste batteries is on the Sigma which will fire for the same duration as the 420 , but will not provide as much light on the subject as the 420 due to the diffusion. This imbalance is what creates the light shadow effect.
Joe. > -----Original Message----- > From: Icoz, Evrim [SMTP:[EMAIL PROTECTED]] > Sent: Monday, October 22, 2001 1:01 PM > To: '[EMAIL PROTECTED]' > Subject: RE: EOS Wireless E-TTL and FEC > > If you put the diffuser on the Sigma, then wouldn't the flash just blast > more power (since it is e-ttl) to compensate? > > thanks, > -e > > * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
