Peter, can you please clarify ? Basically, the flash requires 4xAA set which provides 6V in the case of AA or 4.8V for rechargeable (based on fresh set of the batteries). However, you're talking about simulating one 1.5 V cell instead which is apparently enough in the case the unit is powered by external power pack. According to the manual, 550EX powers its electronics circuitry by the cells even if there is external power pack which supplies the energy for the tube. I would infer from your message, that 1.5V is enough to power the control electronics of the flash while the main power is provided by the power pack.
Regards, Alex Z -----Original Message----- From: [EMAIL PROTECTED] [mailto:owner-eos@;a1.nl]On Behalf Of Kotsinadelis, Peter (Peter) Sent: Monday, October 28, 2002 6:46 PM To: '[EMAIL PROTECTED]' Subject: EOS 550 EX & HV Input Alex Zabrovsky wrote: Hey Michael, according to the manual of my new acquired 550EX, you indeed have to be sure there are 4xAA of rechargeable inside even if you use turbo pack for main power source for the flash. The internal electronics circuitry is powered by the batteries, why the tube energy is supplied by the external pack. ---------------------------------------------------------------------------- -------------------- OK, time for reality. I use a Quantum Turbo with my 550EX flashes. Quantum provides a dummy cell that you substitute for one of the 1.5v alkalines. This minimizes the drain from the AAs and the 550EX relies on the Turbo battery for nearly all power. Now I cannot speak for the Canon power pack, but if it uses the HV input it should be the same. Peter K * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
