> It's likely that shooting at that reduced ISO without filter but on Tungsten
> setting won't get the blue channel gain any higher than with the filter on
> (and high ISO + daylight WB) but haven't actually tried.
Back a few years ago several of us did experiment with this. I sure
did. In my experiments, I found that the chroma noise pattern became
more uniform as the blue-channel noise no longer stood out from the
rest. However, red and green chroma noise did increase. It, however,
was not a problem to deal with.
As this was done about five years ago, I'm struggling to remember what
my test results were, but I concluded that whatever gain was offset by
the convenience. There was definitely something different going on
with highlight transitions--I believe the filtered shot was better.
An aside to this discussion, using B&W filters on a DSLR when shooting
for digital B&W just doesn't work. Shoot full-spectrum and then adjust
later. I would assume, by extension, that anytime you can get the
incoming image to be as close to "daylight balanced" (or sensor native
WB) the better the color mix will be. I know that my DMC-L1 is
absolutely horrid to correct when shooting too far into the "golden
hour".
AG
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