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Response to Grain and tonality in 400 ASA tradional emulsions
from Matthew Hunt (mph@astro.caltech.edu)
Since you mentioned the red sensitivity of Tri-X, I'll just point out
that HP5+ has slightly more red sensitivity. Amateur astronomers know
this because there is an important hydrogen emission line at 656 nm,
and HP5+ captures this light while Tri-X does not. I'd guess that
differences in skin rendering between HP5+ and Tri-X must arise from
some other factor.
(posted 8715 days ago)
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