I confess that the intelligence of my 420EX has caused me to neglect
my flash theory, so this may be a dumb question. It arises from me
trying to discern what I will gain by upgrading to a 580EX. Also,
I've never had Vari-power on an EX flash since the 420 is the only
one I've owned. I've used the feature more on manual flashes.
Is there any functional - i.e. visible - difference between negative
FEC and Vari-power? In other words, given the same exposure mode, is
dialing in -1 stop of FEC the same as leaving FEC at zero and using
1/2 power? My limited understanding of E-TTL also causes me to
wonder how much this changes in various exposure modes, especially Av.
With my current 420EX/30D or Elan 7 setup I can get 2 stops of
negative FEC, so one advantage of the 580EX would be the ability to
go all the way down to 1/128 for macro fill and the like, if these
two are really related.
Any other comments on what real-world, noticeable, pluses there would
be to the upgrade also welcome. I do realize the 580 has a higher
GN, of course. But the 420EX is an amazing little unit, I've never
been disappointed in it. But now that I have a DSLR I'm wanting to
experiment a lot more - what would the 580 do that the 420 can't?
Ken
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