I hadn't ever thought about the Minolta flash meter being fooled by the
ST-E2 (mounted on-camera) infrared signals.  But since an optical slave
(plugged into my non-550EX flash unit) can be fooled by line-of-sight ST-E2
IR signals, then I conclude it's possible the flash meter might be affected
too.  That's a good thought, and I'll test it.

I don't ever use my ST-E2 off-camera, to serve as a remote camera shutter
release.  And thus I don't ever mount my 550EX flash on-camera, but have it
in 'Slave' mode - that doesn't seem to make sense.  Seems like an awfully
expensive remote shutter release system.  

Regards,

Bill Neukranz

-----Original Message-----
From: Vesa Perala [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 10, 2002 10:32 AM
Subject: EOS RE: Flash meters with ETTL

Two questions:

1) I assume the ST-E2 alone (flashes off) will trigger the flash
meter even if it uses near-IR light, right?
Have you measured how much lower the output from ST-E2 alone
is if you compare that to the 550EX full power?

2) If you set an ON-camera 550EX in SLAVE mode and let the
camera exposure meter go off (6 second timeout) will the
ST-E2 trigger it (hand-held)?
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