Yes, setting asa 800 instead of 400 will give the same result
as -1 stop exposure comp. I think the reason they provide
both is to help you avoid confusion -- if you are frequently
changing the asa setting, you could potentially forget what
the "true" asa was. Plus, if you want to -1 comp your asa3200
or +1 comp your asa 6. . . :-) Typically, if you are going to
do the whole roll you would set the asa and if you are going to
do a single frame, you would do the exp. comp.
If you use the exp.comp, that usually means that you think
the scene is one that will confuse your meter (ie, a dark
subject on a bright background would want + comp to avoid
underexposing the foreground, a light subj on a dark bg would
want - comp to avoid blowing out the foreground). When you
do this, you would develop normally -- you are not trying to
change the behavior of the film, you are trying to correct for
a st00pid meter's inability to meter certain scenes correctly.
If you are trying to use your slow film in low light, and
thus want - comp, or if you are trying to increase contrast
(with b&w film anyway), then you'd set the ASA setting higher
and do the whole roll.
Developing "underexposed" film normally at 400 and push
processing it to 800 will, in general, give different results.
With color film, it is more complicated than with b&w, as
not only does the negative density change, but the color shifts
as well. With print film, to a large degree the lab will probably
filter out anything you change within about 2 stops.
joey
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