Hi Jack
Any chance that you're getting specular reflections from the 550EX's pre-flash?
I did some tests with my EOS3 of slightly shiny material and with the 550EX on
camera or near to camera axis, I got under-exposure.  With the 550EX shooting
into a brolly I got very much nicer results and the exposure was more or less
spot on.  (Nothing else was changed between shots.)   I used an ST-E2 to fire
the 550EXs.  Viewing the slides under a microscope showed the specular
reflections quite clearly.  (I'm assuming that the D60 and the EOS3 measure the
pre-flash in the same way - using the sensors reading off the viewfinder
screen.)

In the past, others have suggested using FEL and pegging the flash exposure on a
known tone.  Great advice for static shots but hardly practical for normal use.

Malcolm
Milton Keynes, UK


----- Original Message -----
From: Jack <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, October 15, 2002 11:46 PM
Subject: RE: EOS AF assist light


> Thanks, Dave.  I have yet one more question.
>
> I'm using my ST-E2 with a 550 EX and a D60.  I pretty consistently get
> underexposures - sometimes as much as two stops.  But there is no constant.
> Have you experienced any problem with your setup?
>
> Jack C.
snip

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