Re:canon flash question

Roger Eichhorn <eichhorn@uh.edu> · Thu, 19 Jun 2003 19:22:03 -0500

What was the orientation of the camera relative to the focal plane 
shutter? The line (and the apparent difference between the exposure 
level to the right and left sides of the image) might be a result of 
the slave flash firing slightly behind the built-in flash if the 
orientation was correct for that to happen.  The line is inclined 
slightly, which would suggest that the build up of the intensity of 
the flash coupled with the movement of the shutters could be the 
culprit.  I've never used a slave flash (I don't have one) so this is 
just a speculation.

Roger

Well, of course I have tried it. It isn't working...hence the question.
I can't get the master 550 to become either A or B whihc is necessary to
run ratios. Rereading and chewing the manual very closely indicates that
the master 550 stays out of the ratio grouping and that only slaves
(either 550s and or 420s) can work in ratio mode. The 550 fires the
slaves which are set up in a ratio.

Canon flash rocks but Canon manuals suck...makes figuring this stuff out
very, very tedious.
Lea

----- Original Message -----
From: "luis" <chilled_delirium@mailstation.com>
To: "List for Photo/Imaging Educators - Professionals - Students"
<photoforum@listserver.isc.rit.edu>
Sent: Thursday, June 19, 2003 11:48 AM
Subject: Re:canon flash question

 Lea,
        Why not try it, and check with the flashmeter to see if it is
giving you correct ratios ? I'd do that first, no matter what anyone
here (including me) or at Canon said.

   --- Luis

 ----------------------------------
 I have the 550EX and the 420EX flashes. The 550 can run as a master
and the 420 as a slave and I've been quite successful in getting this to
work with no trouble. What I want to do is work with ratios and I'm
unclear if I can do ratios with the 550 and the 420 ONLY or if I need a
couple 420s to make it go.
 >
 > Anyone familiar with this?
 > Lea
 > tml
 >
 >
 >

--