[QUOTES=Roger Hicks]
"Dear Dan, Um... Film is inherently sensitive to
blue/violet/ultraviolet. Dye sensitization extends
that to green/yellow (ortho), orange/red (pan) ..."
Our usual B&W Films are sensitized well into the red.
When so the green through red sensitivity is well below
the film's inherent blue and shorter wave length sensitivity.
Manufacturers have failed to bring emulsions up to blue speed.
"...the statement that B+W films are 'sensitized to tungsten'
comes very close to sheer nonsense." Cheers, Roger
Good thing I didn't say that. I wrote, "...spectral sensitivity
is balanced across a band around 2800K..." All that is needed
to confirm is a look at any manufacturer's film data sheets. If
blue speed were possible across the spectrum we would
have much higher speed emulsions. Dan |