T3D Re: slow shutter, and coated lenses

[john bercovitz <bercov@xxxxxxxxxxx>]

> Do we know whether increased contrast produces an increased perception
> of color saturation?

About an hour after I sent that, I just _knew_ someone would call me 
on it.  Loose talk always gets me in trouble.  I should have guessed 
the call would be from Eric G.  8-)

What I was trying to say is that with uncoated lenses you get some 
defocussed light bouncing around in the film chamber.  That light 
is white light since the average of what enters the pupil is white 
and the average is what you get if the light is defocussed.  When 
you add white light to a color, you are by definition desaturating 
that color.  This is sort of like loss of contrast but is not precisely 
the same thing.  Loss of contrast means that the ratio of the amount of 
light coming from a light area of the image as compared to what comes 
from a dark area is not up to snuff.  In this case, by adding light to 
all of the areas, you do cause a loss of contrast but that was not what 
the question was, was it?  8-)

John B


------------------------------