Hi Drikus,
> Gerard,
>
> Your answer created some confusion to me. Mayby you can clerify it a bit for
> me (see below)
>
It was not my intention. See below for an answer.
> >> Yes, both. In the case of an external unit with FEC capabilities (like the
> > 550EX), the compensation set on the unit overrides the camera (and
> whatever
> > fill-in compensation the body had calculated)
> >
>
> Are you sure? I always understood that FEC set on camera or flash would be
> added to the automatic fill-in compensation. In the manual for my EOS5 and
> 430EZ I can find nothing about it.
>
Yes. The flash exposure compensation (FEC) set on a E-TTL flash unit with this
facility will override the FEC set on the camera. I can't recall the source (the
550ex users's manual maybe??), but I'm pretty sure (although I've bad memory,
so anybody with hard evidence is welcome to jump in and correct this statement
;-)
> > for fill flash when the meter senses a certain amount of background
> > > brightness such that 'regular' flash would not be needed.
> >
> > I think it's EV12 (125f/5.6) or EV13 (125f/8) ISO 100
> >
> Someone posted the table below sometime earlier
>
> Here's the table of flash exposure compensation applied with the EOS1n
> when used in 'bright' conditions, defeatable via Custom Function 14.
>
> Brightness Compensation stops
> 9 or less 0
> 10 -0.4
> 11 -0.8
> 12 -1.2
> 13 -1.6
> 14 -2.0
> 15 -2.07
> 16 -2.14
> 17 -2.21
> 18 -2.28
> 19 -2.36
> 20 -2.43
> 21 -2.50
> 22 -2.57
>
> Reproduced from September 2000 issue of EOS Magazine.
>
This applies to TTL flash. The E-TTL fill-in reduction algorithm is still hidden
within the Canon engineers whos fingers were cutted after implementing it,
sothat they couldn't reveal the secret on any pirate website.
> > > My understanding
> > > is (correct me if I am wrong) that this 'feature' can not be disabled on
> the
> > > Elan 7.
> >
> > Following what I said before, there's a way: Supose you're using ISO100
> film. You
> > set your ISO to 50 (or 200) and then dial the corresponding compensation
> in the
> > flash and the camera. If you use ISO 50, then you dial -1 EC in the camera
> and -1
> > EC in the flash. Now the flash EC will override the fill-in control in the
> > camera.
> >
>
> Is both needed or is FEC set on the flash alone sufficient?
The setting on the camera is ambient exposure compensation (EC) and is needed to
correct for the changed ISO. Otherwise you will underexpose (or overexpose) your
non-flash shots *AND* IN your fill-in flash shots, the ambient exposure will be
affected by the same 1 stop amount. Thus:
-Change ISO setting (+1 or -1 stop) on camera.
-Set FEC on the flash unit to compensate for the changed ISO (-1 or +1 oposite
to the ISO change)
- Set exposure compensation (EC) on the camera (-1 or +1 oposite to the ISO
change)
Greetings,
Gerard.
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V Gerard MAAS Senior Research Engineer
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